XRAY X4F’27 All-new Features - Part 1.
- New gear differential with lightweight & ultra-reliable design
- New front bulkhead flex adjustment system provides a wide range of flex settings for different track conditions
- New one-piece short lower CFF2™ suspension arms specially designed for X4F increase suspension rigidity and improve overall handling, response, and maximum steering
- New ultra-low anti-roll bar system reduces the center of gravity and improves anti-roll bar performance
- Updated smaller suspension pivot balls reduce weight and increase roll-center tunability
- New carbon fiber steering plates with optimized geometry and flex characteristics to reduce weight and increase mechanical traction
- New carbon fiber ARS plates with two rear link mounting positions to optimize rear suspension geometry and flex characteristics, reduce rear suspension weight, and expand ARS setup adjustment
- New 2.2mm carbon chassis with rear cut-outs integrated with the carbon flex brace system to provide multiple rear flex settings for different track conditions
- New strategically positioned center chassis cut-outs to optimize flex, increase traction and steering response, reduce weight, and expand weight distribution tuning
- Redesigned carbon fiber rear body post holder integrated with the upper clamp for an ultra-durable compact design
- Updated top decks optimized for flex characteristics and compatible with the optional alu braces to expand the flex adjustment alternatives
- New rear bulkhead flex adjustment system provides a wide range of rear flex settings for different track conditions
- Updated 1mm higher shock holders repositioned to complement the updated suspension geometry, increasing suspension travel and providing three flex adjustment positions
- New aluminum ARS posts mounted directly to the chassis instead of the bulkheads to improve steering & rotation
XRAY X4F’27 All-new Features - Part 2.
- Redesigned CFF™ upper arms with optimized flex characteristics provide more consistent handling
- Redesigned lightweight carbon fiber upper clamps for lower CG & optimum flex for more consistent handling, while maintaining maximum crash durability
- Updated smaller differential bearings for reduced weight and lowered center of gravity
- Redesigned servo mount with countersunk holes for perfect fitment also with thinner chassis types
- New front chassis brace provides quick and easy front flex adjustments
- Redesigned motor mount with countersunk holes for perfect fitment also with thinner chassis types
- New aluminum front chassis brace with multiple mounting configurations for extensive front chassis flex tuning
- Adjustable front brace settings optimize the balance of steering response, corner speed, forward traction, and drivability in all different track conditions
- New 30g front bumper weight optimizes front-end weight distribution to reduce weight transfer during acceleration and braking for improved front-end stability and consistent handling
- New 40g front side weights mounted under the front drivetrain increase rotation and corner speed while maintaining predictable handling
- New ultra-lightweight 3D-printed rubber bumper with an H-profile design provides durable crash resistance, optimized compression characteristics, increased airflow under the body, improved front traction, and fitment for the 30g front bumper weight
- Carbon rear chassis brace features three rear flex settings—soft without braces, medium with O-rings, and stiff with fully connected braces—adjust steering response, rotation, mid-corner steering, stability, and drivability for different track sizes and traction conditions
X4F’27
Made in Europe.
Designed, developed, and fully manufactured in-house at the XRAY factory in Slovakia, Europe, using the most high-tech German and Swiss machines and premium European materials, crafted with XRAY's trademark attention to detail by our production specialists. The X4F is truly a masterpiece.
Weight Savings.
30g of total weight savings without compromising durability, especially beneficial in spec class racing when heavier battery packs are needed.
As a result of efficient weight savings in all bulkhead- and suspension components, the car is significantly lighter than the previous X4F.
In additional to the reduced weight resulting in lowered CG, the new X4F offers more choices for balance weight placement making it possible to achieve perfect left- to right balance even when using heavier battery packs.
30g of total weight savings without compromising durability, especially beneficial in spec class racing when heavier battery packs are needed.
As a result of efficient weight savings in all bulkhead- and suspension components, the car is significantly lighter than the previous X4F.
In additional to the reduced weight resulting in lowered CG, the new X4F offers more choices for balance weight placement making it possible to achieve perfect left- to right balance even when using heavier battery packs.
Suspension Arms.
All-new world's unique CFF2™ carbon fiber lower arms with moulded in composite detailing for maximum suspension rigidity and optimal suspension function. The arms are extremely light yet durable.
Suspension Arms.
All-new CFF2™ carbon fiber lower arms with integrated composite detailing for maximum suspension rigidity and optimal suspension function. The arms are extremely light yet durable. The all-new improved suspension geometry with shocks more outboard improves traction and steering response in all conditions. A unique design solution is applied for easy pivot ball assembly while maintaining maximum reliability.
The arms feature a unique design to retain the pivot balls that allows them to be easily installed but resists separation in a hard crash using a directional shape to secure the pivot balls into the lower arm. For the same reason, the lower arms are individual between left and right corners of the car due to the directional shape of each pivot ball socket.
The high-grade carbon fiber material provides maximum rigidity. The integrated composite detailing uses minimal material to keep weight as low as possible. The combined result is very effective solution to increase rigidity while controlling weight for the most responsive suspension characteristics.
All-new CFF2™ carbon fiber lower arms with integrated composite detailing for maximum suspension rigidity and optimal suspension function. The arms are extremely light yet durable. The all-new improved suspension geometry with shocks more outboard improves traction and steering response in all conditions. A unique design solution is applied for easy pivot ball assembly while maintaining maximum reliability.
The arms feature a unique design to retain the pivot balls that allows them to be easily installed but resists separation in a hard crash using a directional shape to secure the pivot balls into the lower arm. For the same reason, the lower arms are individual between left and right corners of the car due to the directional shape of each pivot ball socket.
The high-grade carbon fiber material provides maximum rigidity. The integrated composite detailing uses minimal material to keep weight as low as possible. The combined result is very effective solution to increase rigidity while controlling weight for the most responsive suspension characteristics.
Shock Holders.
Compatible with the included XLP2 shocks, new shock holders align with the updated suspension geometry and bulkhead shape. The new geometry improves cornering speed, mid-corner steering and stability.
The revised shock mounting locations move the shocks more outboard, improving cornering speed and stability, which improves the X4F handling in all conditions. Shocks are placed as close as possible to the driveshafts for the weight to be as centralized as possible.
Shocks are mounted at the front and back of the lower arms for ease of maintenance and better accessibility for quick set-up changes.
The versatile shock holders use shims for adjusting the shock position in precise shock angle increments.
Simplified shock mounting uses a captured mounting stud secured to the shock holder with a special setscrew. It is not necessary to use thread lock as the setscrew will keep the stud secure even during shock install/removal.
Compatible with the included XLP2 shocks, new shock holders align with the updated suspension geometry and bulkhead shape. The new geometry improves cornering speed, mid-corner steering and stability.
The revised shock mounting locations move the shocks more outboard, improving cornering speed and stability, which improves the X4F handling in all conditions. Shocks are placed as close as possible to the driveshafts for the weight to be as centralized as possible.
Shocks are mounted at the front and back of the lower arms for ease of maintenance and better accessibility for quick set-up changes.
The versatile shock holders use shims for adjusting the shock position in precise shock angle increments.
Simplified shock mounting uses a captured mounting stud secured to the shock holder with a special setscrew. It is not necessary to use thread lock as the setscrew will keep the stud secure even during shock install/removal.
Anti-roll Bars.
The ultra-low CG anti-roll bars are attached from above the suspension arms with minimal mounting hardware and materials. The wobble-free anti-roll bar height is easily adjusted via set screw from the top of the arm. The new mounting geometry makes the anti-roll bars more efficient and achieves earlier pickup points from the suspension movement.
The included anti-roll bars were chosen specifically for the typical conditions found when using the carbon and aluminum versions of the X4F for the best possible performance out of the box.
The anti-roll bar pivots in ball-bearings for maximum precision and free movement.
The complete range of different anti-roll bar thicknesses is designed to work with the ball-bearing roll bar mounting system.
Anti-roll bars have laser-engraved stripes (corresponding to bar thickness) for easy identification.
The ultra-low CG anti-roll bars are attached from above the suspension arms with minimal mounting hardware and materials. The wobble-free anti-roll bar height is easily adjusted via set screw from the top of the arm. The new mounting geometry makes the anti-roll bars more efficient and achieves earlier pickup points from the suspension movement.
The included anti-roll bars were chosen specifically for the typical conditions found when using the carbon and aluminum versions of the X4F for the best possible performance out of the box.
The anti-roll bar pivots in ball-bearings for maximum precision and free movement.
The complete range of different anti-roll bar thicknesses is designed to work with the ball-bearing roll bar mounting system.
Anti-roll bars have laser-engraved stripes (corresponding to bar thickness) for easy identification.
Suspension Pivot Balls.
All-new smaller and lower profile suspension pivot balls reduce weight and offer more roll center tunability.
Smaller and lower profile suspension pivot balls reduce weight and offer expanded roll center tunability.
The suspension arm balls are lowered 0.5mm compared to previous kit balls, allowing a lower minimum roll center position compared to previous versions.
The hub ball studs are also lowered 0.5mm compared to the previous kit, allowing for a lower roll center to be used, without modifying the parts.
All-new smaller and lower profile suspension pivot balls reduce weight and offer more roll center tunability.
Smaller and lower profile suspension pivot balls reduce weight and offer expanded roll center tunability.
The suspension arm balls are lowered 0.5mm compared to previous kit balls, allowing a lower minimum roll center position compared to previous versions.
The hub ball studs are also lowered 0.5mm compared to the previous kit, allowing for a lower roll center to be used, without modifying the parts.
Arms Comparison.
Upper Arms.
All-new CFF™ upper arms have redesigned shape for improved flex characteristics for more consistent handling. Link style upper link arms are also included in each kit as a tuning option that can increase steering response and provide additional adjustability out of the box.
The unique CFF™ upper arms provide maximum mechanical grip and require minimal set-up work for great all-around handling and easy assembly.
Including the CFF™ arms, as well the link arms, offer the driver the freedom of choice to expand the tuning possibilities of their X4F’27.
The adjustable link upper suspension arms provide expanded adjustability choices beyond those of the traditional CFF™ upper arms for maximum tunability and enhanced steering response.
The link style upper arms provide fully adjustable camber and caster settings using 2 turnbuckles in each upper arm at all 4 corners.
The turnbuckles are connected using ball cups from durable composite materials.
The X4F Caster Gauges, #302390, are recommended for enhanced accuracy when building and adjusting the link arms.
All-new CFF™ upper arms have redesigned shape for improved flex characteristics for more consistent handling. Link style upper link arms are also included in each kit as a tuning option that can increase steering response and provide additional adjustability out of the box.
The unique CFF™ upper arms provide maximum mechanical grip and require minimal set-up work for great all-around handling and easy assembly.
Including the CFF™ arms, as well the link arms, offer the driver the freedom of choice to expand the tuning possibilities of their X4F’27.
The adjustable link upper suspension arms provide expanded adjustability choices beyond those of the traditional CFF™ upper arms for maximum tunability and enhanced steering response.
The link style upper arms provide fully adjustable camber and caster settings using 2 turnbuckles in each upper arm at all 4 corners.
The turnbuckles are connected using ball cups from durable composite materials.
The X4F Caster Gauges, #302390, are recommended for enhanced accuracy when building and adjusting the link arms.
Upper Link Arms.
Adjustable link upper suspension arms provide expanded adjustability choices beyond those of the traditional CFF™ upper arms for maximum adjustability and improve handling in certain conditions.
Including the CFF™ arms and the new link arms in the kit offers the driver the freedom of choice to expand the adjustment possibilities of their X4F.
The upper link arms provide fully adjustable camber- and caster settings using 2 turnbuckles in each upper arm at all 4 corners.
The turnbuckles are connected using ball cups from durable composite materials.
The X4F Caster Gauges, #302390, are recommended for enhanced accuracy when building and adjusting the link arms.
Adjustable link upper suspension arms provide expanded adjustability choices beyond those of the traditional CFF™ upper arms for maximum adjustability and improve handling in certain conditions.
Including the CFF™ arms and the new link arms in the kit offers the driver the freedom of choice to expand the adjustment possibilities of their X4F.
The upper link arms provide fully adjustable camber- and caster settings using 2 turnbuckles in each upper arm at all 4 corners.
The turnbuckles are connected using ball cups from durable composite materials.
The X4F Caster Gauges, #302390, are recommended for enhanced accuracy when building and adjusting the link arms.
Upper Clamps.
All-new carbon fiber upper clamps reduce overall weight, lower CG and improve control of chassis flex. The new upper clamps are lightweight to keep the car’s CG low. The heavy-duty design retains maximum durability in case of a crash. The design features minimal flex that produces consistent handling in all conditions.
Ultra-long link upper arms are made easier with the new upper clamp design, providing an additional alternative to the standard upper arm length. The longer upper arm configuration improves stability and consistency on medium to high grip conditions because of the reduced camber gain.
The heavy-duty upper clamps feature exceptional durability in hard crashes and match the updated suspension geometry and bulkhead shape.
The upper clamps use caster inserts for quick and easy set-up changes, and feature centering pins for precise installation and improved crash reliability.
The screws installed from the bottom of the caster inserts capture the inserts in the upper clamps to secure the inserts while servicing the car. The screws also serve as the upper arms pivot ball mounts, reducing the number of components in the assembly and reducing weight.
The upper clamps are made from premium grade carbon fiber from USA. The caster inserts are made from a premium grade 7075 T6 aluminum material.
All-new carbon fiber upper clamps reduce overall weight, lower CG and improve control of chassis flex. The new upper clamps are lightweight to keep the car’s CG low. The heavy-duty design retains maximum durability in case of a crash. The design features minimal flex that produces consistent handling in all conditions.
Ultra-long link upper arms are made easier with the new upper clamp design, providing an additional alternative to the standard upper arm length. The longer upper arm configuration improves stability and consistency on medium to high grip conditions because of the reduced camber gain.
The heavy-duty upper clamps feature exceptional durability in hard crashes and match the updated suspension geometry and bulkhead shape.
The upper clamps use caster inserts for quick and easy set-up changes, and feature centering pins for precise installation and improved crash reliability.
The screws installed from the bottom of the caster inserts capture the inserts in the upper clamps to secure the inserts while servicing the car. The screws also serve as the upper arms pivot ball mounts, reducing the number of components in the assembly and reducing weight.
The upper clamps are made from premium grade carbon fiber from USA. The caster inserts are made from a premium grade 7075 T6 aluminum material.
Upper Clamp Flex Options.
All-new upper clamp design also offers multiple mounting alternatives that alter chassis flex and handling characteristics. The clamps feature 3 screws that are installed in different combinations for 4 different flex options.
Steering & ARS Plates.
All-new carbon fiber steering & ARS plates for optimized flex and reduced unsprung weight of the suspension. The carbon plates increase mechanical grip thanks to the optimized flex and shape used.
The plates are strategically lightened to not sacrifice durability yet retaining minimal weight.
The steering & ARS plates are machined from premium grade carbon fiber from USA.
Gear Differential.
All-new ultra lightweight, narrower gear differential to accommodate for new bulkheads. The new differential utilizes smaller 6x10x3 ball bearings, together with smaller eccentric bearing holders, for reduced weight and lower CG. The differential features a secure and reliable pin system for the outdrives.
The gear differential includes steel diff outdrives for the BB drive shafts. The X4F gear diff produces the on-power steering that is needed on nearly all types of tracks and is ideal for both carpet and asphalt tracks.
The gear diff includes a composite case and cover with the integrated pulley. The internal gears are precision molded from tough composite material and combined with steel drive shaft adapters to create a light and super-smooth differential.
Another key advantage of the gear diff is that it is virtually maintenance-free. When the diff is correctly built, there is no need for maintenance for a very long time… no need for frequent oil changes, and no leakage due to the superior sealing system.
All-new ultra lightweight, narrower gear differential to accommodate for new bulkheads. The new differential utilizes smaller 6x10x3 ball bearings, together with smaller eccentric bearing holders, for reduced weight and lower CG. The differential features a secure and reliable pin system for the outdrives.
The gear differential includes steel diff outdrives for the BB drive shafts. The X4F gear diff produces the on-power steering that is needed on nearly all types of tracks and is ideal for both carpet and asphalt tracks.
The gear diff includes a composite case and cover with the integrated pulley. The internal gears are precision molded from tough composite material and combined with steel drive shaft adapters to create a light and super-smooth differential.
Another key advantage of the gear diff is that it is virtually maintenance-free. When the diff is correctly built, there is no need for maintenance for a very long time… no need for frequent oil changes, and no leakage due to the superior sealing system.
Bearing Holders.
Both front and rear bulkheads feature additional integrated belt-tension adjustment using adjustable bearing eccentric holders. All-new design for 2027 to accommodate for the smaller 6x10x3mm spool & diff bearings, for reduced weight and lower CG.
R&D Team.
Successful development of the X4F – like all other XRAY platforms – would not be possible without the entire racing team’s involvement working year-round to test new ideas, prototypes, and improvements. The racing team participates at events all around the world and provides XRAY drivers with first-class support & service; benefits of being a part of the XRAY team.
Standard Features.
Some information shown below may include details from previous kits, and it may vary slightly from current kit specifications.
XLP vs XLP2.
XLP2 shocks are 4mm lower compared to the previous XLP, improving cornering speed, mid-corner steering and stability, and minimizing traction rolls in high traction conditions.
XLP2 Shock Absorbers.
All the XLP2 shock parts are specifically designed for the smallest possible size to reduce the weight and keep the lowest possible CG.
Shock bodies are CNC-machined from premium Swiss 7075 T6 aluminum and hardened to ensure the maximum lifespan. The aluminum upper and lower nuts have a low-profile design, including sealing O-ring and upper composite ball joint. The shock shaft, shock adjustable nut, spring retainer and pivot balls are designed to achieve the lowest shock height possible.
The included shock pistons sets are 4-hole pistons with 1.1 and 1.2mm diameter holes. The pistons are molded using a special process and composites to ensure extreme roundness while maintaining maximum stiffness and durability.
All the XLP2 shock parts are specifically designed for the smallest possible size to reduce the weight and keep the lowest possible CG.
Shock bodies are CNC-machined from premium Swiss 7075 T6 aluminum and hardened to ensure the maximum lifespan. The aluminum upper and lower nuts have a low-profile design, including sealing O-ring and upper composite ball joint. The shock shaft, shock adjustable nut, spring retainer and pivot balls are designed to achieve the lowest shock height possible.
The included shock pistons sets are 4-hole pistons with 1.1 and 1.2mm diameter holes. The pistons are molded using a special process and composites to ensure extreme roundness while maintaining maximum stiffness and durability.
Servo Mount.
The one-piece design of the servo mount eliminates servo movement in serious crashes. The servo mount features an ultra-low design to save weight, and to lower CG as much as possible.
Battery Holder.
The battery mounting system is integrated with the servo mount, allowing the battery to move as far forward as possible to improve traction.
The tweak-free, fully adjustable Quick Battery Mounting System offers simple and secure battery installation without tape and without adverse effects on chassis flex.
The system controls the positioning of the pack in the chassis while at the same time reducing the battery pack’s impact on chassis flex, resulting in more consistent handling and stability.
Smart battery holders are specifically designed for LiPo batteries and are reinforced for harder impacts. The battery holders prevent the batteries from moving under racing conditions and crashes.
The battery holder is integrated into the servo mount. In the rear the battery holder is mounted to the chassis and is adjustable in all directions.
The battery mounting system is integrated with the servo mount, allowing the battery to move as far forward as possible to improve traction.
The tweak-free, fully adjustable Quick Battery Mounting System offers simple and secure battery installation without tape and without adverse effects on chassis flex.
The system controls the positioning of the pack in the chassis while at the same time reducing the battery pack’s impact on chassis flex, resulting in more consistent handling and stability.
Smart battery holders are specifically designed for LiPo batteries and are reinforced for harder impacts. The battery holders prevent the batteries from moving under racing conditions and crashes.
The battery holder is integrated into the servo mount. In the rear the battery holder is mounted to the chassis and is adjustable in all directions.
Steering Arm.
Smart adjustable steering arm provides easy Ackermann tuning by changing the eccentric bushings.
Small, easy to use, eccentric bushings are used to set the steering geometry and allows for several different Ackermann settings.
The bushings are quickly installed and removed from the steering assembly for quick trackside set-up adjustments.
The bushings are machined from 7075 T6 aluminum material for the best possible precision & fitment.
The steering arm features a simple design of few components, for maximum weight savings.
Smart adjustable steering arm provides easy Ackermann tuning by changing the eccentric bushings.
Small, easy to use, eccentric bushings are used to set the steering geometry and allows for several different Ackermann settings.
The bushings are quickly installed and removed from the steering assembly for quick trackside set-up adjustments.
The bushings are machined from 7075 T6 aluminum material for the best possible precision & fitment.
The steering arm features a simple design of few components, for maximum weight savings.
Top Deck.
The included top decks match the forward FWD layshaft position. Rear top deck with a more open rear section improves rotation and off-power steering.
The rear top deck uses only one pair of mounting screws for increased flex, resulting in improved rotation.
The front top deck features no cut-out to reduce front flex and thus, improve steering precision.
The 2pc top deck features reinforced motor mount screw areas for high durability, improved steering and traction.
The Multi-Flex™ top deck has a narrow shape for easier installation, improved handling characteristics and features several different flex options out of the box using top deck screws.
The machined ultra-precise top deck screws ensure the top deck is mounted completely tweak-free to improve the flex characteristics.
Made from 2.0mm carbon material, the shape of the top deck has been specifically designed to achieve maximum traction and great steering characteristics at the same time. Optional one-piece top deck features 8 different flex options.
The included top decks match the forward FWD layshaft position. Rear top deck with a more open rear section improves rotation and off-power steering.
The rear top deck uses only one pair of mounting screws for increased flex, resulting in improved rotation.
The front top deck features no cut-out to reduce front flex and thus, improve steering precision.
The 2pc top deck features reinforced motor mount screw areas for high durability, improved steering and traction.
The Multi-Flex™ top deck has a narrow shape for easier installation, improved handling characteristics and features several different flex options out of the box using top deck screws.
The machined ultra-precise top deck screws ensure the top deck is mounted completely tweak-free to improve the flex characteristics.
Made from 2.0mm carbon material, the shape of the top deck has been specifically designed to achieve maximum traction and great steering characteristics at the same time. Optional one-piece top deck features 8 different flex options.
Compatibility.
X4F is designed and based on the X4 platform and as such majority of parts are fully compatible.
Motor Mount.
The motor mount has been repositioned 5mm further forward for more traction. The clamping screw is moved closer to the motor to create space for the steering arm.
The motor mount and its slick low-profile design eliminates top deck collisions during chassis flex. The motor mount features 3mm centering pins for exceptional crash durability when using only one mounting screw.
The X4F motor and layshaft mounts are integrated into a one-piece design that is placed on the absolute center line of the chassis. The motor mount has a pressed-in steel layshaft axle with the motor located to the front of the layshaft. The motor mount is designed to maintain a super low CG but is still robust enough to resist bending in serious crashes. The robust design reinforces the chassis and improves the stability of the X4F.
The top of the motor mount features special milled holes to match the machined ultra-precise top deck screws made in-house. These purpose-made screws ensure the top deck is mounted completely tweak-free to improve the flex characteristics.
An aluminum eccentric bulkhead insert is accessible through a cutout in the mount and is adjusted from the top for easier gear mesh adjustment.
Machined from premium Swiss 7075 T6 aluminum and black anodized.closer to the motor to create space for the steering arm.
The motor mount has been repositioned 5mm further forward for more traction. The clamping screw is moved closer to the motor to create space for the steering arm.
The motor mount and its slick low-profile design eliminates top deck collisions during chassis flex. The motor mount features 3mm centering pins for exceptional crash durability when using only one mounting screw.
The X4F motor and layshaft mounts are integrated into a one-piece design that is placed on the absolute center line of the chassis. The motor mount has a pressed-in steel layshaft axle with the motor located to the front of the layshaft. The motor mount is designed to maintain a super low CG but is still robust enough to resist bending in serious crashes. The robust design reinforces the chassis and improves the stability of the X4F.
The top of the motor mount features special milled holes to match the machined ultra-precise top deck screws made in-house. These purpose-made screws ensure the top deck is mounted completely tweak-free to improve the flex characteristics.
An aluminum eccentric bulkhead insert is accessible through a cutout in the mount and is adjusted from the top for easier gear mesh adjustment.
Machined from premium Swiss 7075 T6 aluminum and black anodized.closer to the motor to create space for the steering arm.
Weight Savings.
The X4F’26 is very light. In addition to the overall weight savings, the rear suspension has been strategically lightened to shift the weight bias even more to the front tires. Additionally, all the electronics are moved as far forward as possible, for additional weight bias improvements to maximize traction.
Thanks to the lightened design, racers have greater weight distribution options for easier adaptation to different track conditions.
Bulkheads.
The bulkheads feature a higher ARS link mounting position allowing greater adjustment possibilities, the horizontal orientation allows moving the ARS link frontwards or backwards to alter rotation characteristics.
The bulkheads use centering pins for easier positioning on the chassis and for increased rigidity and consistency.
The anti-roll bar mounting position keeps the wire bar placed under the drive shafts for a super low CG.
Made from premium Swiss 7075 T6 aluminum, black anodized.
The bulkheads feature a higher ARS link mounting position allowing greater adjustment possibilities, the horizontal orientation allows moving the ARS link frontwards or backwards to alter rotation characteristics.
The bulkheads use centering pins for easier positioning on the chassis and for increased rigidity and consistency.
The anti-roll bar mounting position keeps the wire bar placed under the drive shafts for a super low CG.
Made from premium Swiss 7075 T6 aluminum, black anodized.
Shock Holders Flex Settings.
Front & rear shock holders have three different mounting options for different chassis flex alternatives. The flex options have a significant impact on handling and are used to fine-tune handling for different conditions.
Drive Belts.
The X4F’26 uses a short drive belt which is made to work with a forward layshaft position for improved traction.
The 1-belt 2WD drivetrain concept provides maximum efficiency featuring 3mm narrow drive belt that has been specially ground for minimal thickness and maximum flexibility
- Short belt length fits forward layshaft position
- Layshaft position is maximum forward for improved traction
- 3mm width for maximum efficiency
Hubs.
Medium composite hubs improve traction and steering characteristics..
The composite hubs provide the proper suspension geometry for improved steering and traction. The hubs contain small size bearings and a drive axle that moves the driveshaft pivot point deep into the hub, in line with the hub’s rotational axis between the upper and lower arm. This alignment improves driveline efficiency and handling.
The hubs allow full adjustability of the axle height to adapt the car to every condition.
The design of the hub is universal with the same part used at all four corners with corresponding extensions. The aluminum front steering plates and rear ARS plates are easily mounted depending on the hub’s location.
Medium composite hubs improve traction and steering characteristics..
The composite hubs provide the proper suspension geometry for improved steering and traction. The hubs contain small size bearings and a drive axle that moves the driveshaft pivot point deep into the hub, in line with the hub’s rotational axis between the upper and lower arm. This alignment improves driveline efficiency and handling.
The hubs allow full adjustability of the axle height to adapt the car to every condition.
The design of the hub is universal with the same part used at all four corners with corresponding extensions. The aluminum front steering plates and rear ARS plates are easily mounted depending on the hub’s location.
BB Drive Shafts.
Our unique ECS system uses a redesigned drive shaft case with a C clip groove to secure the aluminum pin retainer.
Thanks to this unique SCS – Spring Clip System, no set screws are needed to capture the coupler pins, making the ECS assemblies easier and more convenient to assemble, and more reliable.
The driveshaft service life is increased as the pins float freely in the joints, ensuring smoother rotation and improved cornering speed.
BB drive shafts improve speed & rotation and are included in the kit and feature a clip wheel hub retention system included for maximum comfort.
The X4F features 58mm ECS drive shafts with geometry that places the drive axle pivot point in line with the rotation of the hubs for maximum efficiency and cornering speed.
The XRAY ECS drive shafts equalize the speed between the drive shaft and the wheel when cornering. With a unique 2-piece joint between the driveshaft and the wheel, an extreme turning angle is divided into two shallower angles in the ECS assembly to prevent bind while rotating. Regardless of cornering speed and wheel angle, the inner wheel will not bind or vibrate when using the ECS. Movement through the corner is more stable and precise. With the ECS drive shafts, wheel vibrations and noise are decreased to a minimum, steering is increased, and cornering speed & smoothness are noticeably improved.
ECS drive shafts are exclusively manufactured from special self-developed HUDY Spring Steel™. The drive shafts are strategically lightened to guarantee the lowest possible weight without compromising strength or durability.
Our unique ECS system uses a redesigned drive shaft case with a C clip groove to secure the aluminum pin retainer.
Thanks to this unique SCS – Spring Clip System, no set screws are needed to capture the coupler pins, making the ECS assemblies easier and more convenient to assemble, and more reliable.
The driveshaft service life is increased as the pins float freely in the joints, ensuring smoother rotation and improved cornering speed.
BB drive shafts improve speed & rotation and are included in the kit and feature a clip wheel hub retention system included for maximum comfort.
The X4F features 58mm ECS drive shafts with geometry that places the drive axle pivot point in line with the rotation of the hubs for maximum efficiency and cornering speed.
The XRAY ECS drive shafts equalize the speed between the drive shaft and the wheel when cornering. With a unique 2-piece joint between the driveshaft and the wheel, an extreme turning angle is divided into two shallower angles in the ECS assembly to prevent bind while rotating. Regardless of cornering speed and wheel angle, the inner wheel will not bind or vibrate when using the ECS. Movement through the corner is more stable and precise. With the ECS drive shafts, wheel vibrations and noise are decreased to a minimum, steering is increased, and cornering speed & smoothness are noticeably improved.
ECS drive shafts are exclusively manufactured from special self-developed HUDY Spring Steel™. The drive shafts are strategically lightened to guarantee the lowest possible weight without compromising strength or durability.
Top Deck Multi Flex Settings.
The top deck flex settings allow quick and easy adjustment of chassis stiffness in 2 different alternatives.
Motor Bulkhead Insert.
The motor bulkhead insert moves the motor 1mm further compared inward improving the roll characteristics. The motor bulkhead inserts also allow for more space for pinion mounting.
XLP Shock Springs.
The XLP series of springs are 3mm shorter to match the XLP shock length and provide the correct rates and ride height. They are available in a full range of rate choices including 2 extra alternatives of the progressive springs C2.4-2.7 and C2.6-2.9.
The X4/X4F stock shock springs offer versatile out of box performance for many conditions. The most popular C2.5-2.8 in front and C2.6 in rear are included in the kit.
All XRAY springs are manually measured, selected, and matched into pairs to guarantee precisely equal length and damping characteristics.
The XLP series of springs are 3mm shorter to match the XLP shock length and provide the correct rates and ride height. They are available in a full range of rate choices including 2 extra alternatives of the progressive springs C2.4-2.7 and C2.6-2.9.
The X4/X4F stock shock springs offer versatile out of box performance for many conditions. The most popular C2.5-2.8 in front and C2.6 in rear are included in the kit.
All XRAY springs are manually measured, selected, and matched into pairs to guarantee precisely equal length and damping characteristics.
Wheel Hubs.
The wheel hubs work with the SCS - Spring Clip System for simplified installation. The wheel hubs are 0.5mm narrower than the original X4F hexes to reduce the car’s track width, to increase steering and traction.
The ultra-narrow wheel hubs are lightened for reduced rotating mass.
Spring Clip System.
The SCS – Spring Clip System allow for super easy, fast and simplified installation of the wheel hubs on the drive shafts. Now it takes just one click to install or remove the wheel hub and you can forget about the hassle with the outer C-clips. Smart & easy.
Rear Hub Height Adjustment.
The kit includes 6.5mm pivot balls for different rear hub height adjustments. The 6.5mm long pivot balls with 1mm extra thread length is suggested when using more than a 0.5mm hub height shim to improve the durability of the rear hub in serious crashes.
Suspension Mounting.
All suspension components mount directly to the CFF™ arms without additional parts, eliminating play between pieces to ensure accuracy and reliability.
Thanks to the unique design of the CFF™ arms, all the suspension components are mounted directly on the arm without additional brackets, bushings or extensions. This direct mounting eliminates unwanted play between these extra components. Most importantly, the reliability and accuracy of the direct mounting ensure that settings remain consistent during a run even after a crash.
All suspension components mount directly to the CFF™ arms without additional parts, eliminating play between pieces to ensure accuracy and reliability.
Thanks to the unique design of the CFF™ arms, all the suspension components are mounted directly on the arm without additional brackets, bushings or extensions. This direct mounting eliminates unwanted play between these extra components. Most importantly, the reliability and accuracy of the direct mounting ensure that settings remain consistent during a run even after a crash.
Suspension Mounting.
This direct mounting eliminates unwanted play between these extra components. Most importantly, the reliability and accuracy of the direct mounting ensure that settings remain consistent during a run even after a crash.
Battery Backstops.
Integrated battery backstops set the battery position to adjust weight balance and prevent interference with the spur gear.
Integrated battery backstops set the battery position to adjust weight balance and prevent interference with the spur gear.
Serving a dual purpose, the aluminum washer secures the layshaft to the motor mount and functions as a backstop to prevent battery pack movement. An additional backstops are mounted directly to the chassis.
The battery backstops prevent the batteries from moving in a crash and interfering with the spur gear on the center layshaft.
Middle Layshaft.
The super-lightweight hollow aluminum layshaft eliminates drivetrain vibration.
The super-lightweight hollow aluminum layshaft eliminates drivetrain vibration.
The aluminum layshaft is strategically CNC-machined to minimize rotating weight without compromising strength or integrity. The hollow layshaft is perfectly round with zero run out, reducing drivetrain vibration.
The lay shaft is machined from premium Swiss 7075 T6 aluminum and then black coated.
The composite belt pulleys key solidly to the layshaft, and the completed assembly is installed onto the motor mount’s steel layshaft axle.
Centering Pins.
All chassis mounted aluminum framework parts including the bulkheads, motor mount, servo holder, front shock towers and rear body post plates feature centering pins for easy assembly and maximum reliability in a crash.
Spur Gears & Pulleys.
Precision-molded spur gears are made from XRAY's exclusive composite material, ensuring true running, super-quiet operation, and robustness for handling powerful motors. A range of optional spur gears for fine tuning is available.
Spur Gears & Pulleys.
Precision-molded spur gears are made from XRAY's exclusive composite material, ensuring true running, super-quiet operation, and robustness for handling powerful motors. A range of optional spur gears for fine tuning is available.
Special Hardware.
To ensure maximum performance, the X4F's high-precision pivot balls are machined in-house and then black coated or nickel coated for a smooth and long lasting finish. To maintain proper balance through every run, the in-house machined top deck screws ensure tweak free handling from start to finish.
Special Hardware.
To ensure maximum performance, the X4F's high-precision pivot balls are machined in-house and then black coated or nickel coated for a smooth and long lasting finish. To maintain proper balance through every run, the in-house machined top deck screws ensure tweak free handling from start to finish.
Ball-Bearings.
A full set of 24 high-speed, blue-sealed and steel ball-bearings are used throughout the drivetrain, steering and anti-roll bars to ensure maximum efficiency.
A full set of 24 high-speed, blue-sealed and steel ball-bearings are used throughout the drivetrain, steering and anti-roll bars to ensure maximum efficiency. All of the bearings are degreased and oiled with Aero Shell® Fluid 12 for maximum smoothness and long life. The bearings used in steering blocks and uprights have been specially selected to reduce unsprung weight and maximize drivetrain efficiency.
Silicone Oils.
HUDY Exclusive Silicone Oils are manufactured in Europe and each batch is laboratory tested and calibrated to ensure the highest possible consistency and quality from batch to batch. Based on the industry-standard cSt rating, the new line of oils will be easy to identify, adjust, and feel.
When following any set-up sheets by XRAY or XRAY team drivers, you can be sure that the oils you will get for your car are exactly same as those used by the factory racing team, thus ensuring very exacting set-ups and handling.
Silicone Oils.
HUDY Exclusive Silicone Oils are manufactured in Europe and each batch is laboratory tested and calibrated to ensure the highest possible consistency and quality from batch to batch. Based on the industry-standard cSt rating, the new line of oils will be easy to identify, adjust, and feel.
When following any set-up sheets by XRAY or XRAY team drivers, you can be sure that the oils you will get for your car are exactly same as those used by the factory racing team, thus ensuring very exacting set-ups and handling.
Chassis Balance.
The chassis features pre-drilled holes for additional weights for optimum car balancing and centerline holes for easy balancing with the HUDY Chassis Balancing Tool #107880.
Adjustment Possibilities.
The extensive and impressive range of adjustment possibilities includes: ARS (Active Rear Suspension™), caster, camber, toe, anti-dive, anti-squat, ride height, downstops, track-width, lower roll center, upper roll center, roll center positions, steering roll center, wheelbase, Ackermann, steering lock, bumpsteer, belt-tension adjustment, adjustable shocks, adjustable in-line flex adjustment, adjustable front chassis flex, diff height and adjustable diff.
Adjustment Possibilities.
The extensive and impressive range of adjustment possibilities includes: ARS (Active Rear Suspension™), caster, camber, toe, anti-dive, anti-squat, ride height, downstops, track-width, lower roll center, upper roll center, roll center positions, steering roll center, wheelbase, Ackermann, steering lock, bumpsteer, belt-tension adjustment, adjustable shocks, adjustable in-line flex adjustment, adjustable front chassis flex, diff height and adjustable diff.
XRAY Instruction Manual.
XRAY instruction manuals have become the industry standard, being simply the best manuals you will ever get with an RC model car. Whether you are a first-time builder or an experienced racer, all the instructions are straight-forward and easy to understand. The full-color Instruction Manual contains large 3D illustrations that show all assembly details in the clearest possible way.
Tech Tip Videos.
To get the finest tips & tricks on how to build the X4F or to learn more about each of the set-up options, follow the series of XRAY X4 Tech Tip videos featuring Alexander Hagberg and Stefan Schulz. The videos walk through each section of the building process with suggested assembly techniques, demonstrations, and detailed explanations of the various setup adjustments.
Please note that the videos are made specifically for the X4, but will contain very good information that may apply to the X4F as well.
Tech Tip Videos.
To get the finest tips & tricks on how to build the X4F or to learn more about each of the set-up options, follow the series of XRAY X4 Tech Tip videos featuring Alexander Hagberg and Stefan Schulz. The videos walk through each section of the building process with suggested assembly techniques, demonstrations, and detailed explanations of the various setup adjustments.
Please note that the videos are made specifically for the X4, but will contain very good information that may apply to the X4F as well.
XRAY VIP Customer Treatment.
Not only will you own the most premium luxury model racing car in the world, but you will also become a member of the prestigious family of XRAY owners with direct support and service from the XRAY factory. XRAY brings you the most up-to-date RC Web site on the Internet, with daily racing news and latest product developments.
If you have any questions, problems or comments, you can ask the XRAY Support Team or any XRAY Factory Team Driver on the XRAY Tech Talk groups. You can even upload your own set-up sheets or download from the thousands of different set-up sheets available from all around the world at the exclusive XRAY Virtual Set-up Sheet Database, the world’s largest set-up sheet database. And that is only the start of the VIP treatment you get by joining Team XRAY.
Not only will you own the most premium luxury model racing car in the world, but you will also become a member of the prestigious family of XRAY owners with direct support and service from the XRAY factory. XRAY brings you the most up-to-date RC Web site on the Internet, with daily racing news and latest product developments.
If you have any questions, problems or comments, you can ask the XRAY Support Team or any XRAY Factory Team Driver on the XRAY Tech Talk groups. You can even upload your own set-up sheets or download from the thousands of different set-up sheets available from all around the world at the exclusive XRAY Virtual Set-up Sheet Database, the world’s largest set-up sheet database. And that is only the start of the VIP treatment you get by joining Team XRAY.