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All-new 2022

  • New chassis layout with center slipper/diff, motor and battery moved significantly forward makes the car faster and easier to drive on any surface
  • Unique XRAY one-way center slipper with precisely adjustable slipper for more forward traction, less diving under braking and easier landings
  • Revised chassis with forward design and optimized flex
  • Side guards have now symmetrical mounting to the chassis left and right
  • Chassis features multiple battery mounting positions with various O-ring diameters for every battery size
  • Center dogbones for better performance and less maintenance
  • New front & rear diff outdrives for center dogbones with inner O-rings to eliminate damage in high impacts
  • New redesigned servo holder matches new chassis design and the more forward layout
  • Shorter radio plate is fitted directly on chassis so it has no negative effect on chassis flex
  • New aluminum center bulkhead to fit new XRAY one-way center slipper (Carpet version)
  • Unified arm length for both Carpet and Dirt versions. Both kits come with short length hard front arms and long hard rear arms in the hard composite.
  • New shorter front lower chassis brace to accommodate the more forward layout
  • New front lower graphite chassis brace (Dirt version) to match the more forward layout
  • Front graphite chassis T-Brace (Carpet edition) to increase front stability on high traction tracks, making the car more predictable and easier to drive. The T-Brace is mounted via included aluminum posts to the chassis and to the front lower brace.
  • Different center upper top decks included in the Carpet and Dirt versions due to the dimensions of the one-way slipper vs gear diff

All-new 2022

  • New chassis layout with center slipper/diff, motor and battery moved significantly forward makes the car faster and easier to drive on any surface.
  • Unique XRAY one-way center slipper with precisely adjustable slipper for more forward traction, less diving under braking and easier landings
  • Revised chassis with forward design and optimized flex
  • Side guards have now symmetrical mounting to the chassis left and right
  • Chassis features multiple battery mounting positions with various O-ring diameters for every battery size
  • Center dogbones for better performance and less maintenance
  • New front & rear diff outdrives for center dogbones with inner O-rings to eliminate damage in high impacts
  • New redesigned servo holder matches new chassis design and the more forward layout
  • Shorter radio plate is fitted directly on chassis so it has no negative effect on chassis flex
  • New aluminum center bulkhead to fit new XRAY one-way center slipper (Carpet version)
  • Unified arm length for both Carpet and Dirt versions. Both kits come with short length hard front arms and long hard rear arms in the hard composite.
  • New shorter front lower chassis brace to accommodate the more forward layout
  • New front lower graphite chassis brace (Dirt version) to match the more forward layout

  • New chassis layout with center slipper/diff, motor and battery moved significantly forward makes the car faster and easier to drive on any surface.
  • Unique XRAY one-way center slipper with precisely adjustable slipper for more forward traction, less diving under braking and easier landings
  • Revised chassis with forward design and optimized flex
  • Side guards have now symmetrical mounting to the chassis left and right
  • Chassis features multiple battery mounting positions with various O-ring diameters for every battery size
  • Center dogbones for better performance and less maintenance
  • New front & rear diff outdrives for center dogbones with inner O-rings to eliminate damage in high impacts
  • New redesigned servo holder matches new chassis design and the more forward layout
  • Shorter radio plate is fitted directly on chassis so it has no negative effect on chassis flex
  • New aluminum center bulkhead to fit new XRAY one-way center slipper (Carpet version)
  • Unified arm length for both Carpet and Dirt versions. Both kits come with short length hard front arms and long hard rear arms in the hard composite.
  • New shorter front lower chassis brace to accommodate the more forward layout
  • New front lower graphite chassis brace (Dirt version) to match the more forward layout
  • Front graphite chassis T-Brace (Carpet edition) to increase front stability on high traction tracks, making the car more predictable and easier to drive. The T-Brace is mounted via included aluminum posts to the chassis and to the front lower brace.
  • Different center upper top decks included in the Carpet and Dirt versions due to the dimensions of the one-way slipper vs gear diff

World Champions.

At the World’s most competitive off-road race – the IFMAR World Championship, it was XRAY’s Bruno Coelho and Daniel Kobbevik securing another World Champion and Junior Champion titles for the XB4 platform.

XRAY XB4 – the 4x World Champion 1/10 off-road 4WD car that will bring you to the Winners’ Circle.

Made in Europe.

Engineered and manufactured in-house at the XRAY factory located in Slovakia, Europe, the XB4 is a fantastic demonstration of XRAY’s attention to detail in all of its products. The XB4 is created by XRAY’s design staff using premium European materials and sophisticated German and Swiss machines.

Made in Europe.

Engineered and manufactured in-house at the XRAY factory located in Slovakia, Europe, the XB4 is a fantastic demonstration of XRAY’s attention to detail in all of its products. The XB4 is created by XRAY’s design staff using premium European materials and sophisticated German and Swiss machines.

USA Champion.

XRAY’s Ty Tessmann achieved the first ROAR National Championship for the XB4. Tested and successfully run in the highest competition races now you can enjoy the winning platform.

European Champions.

With ongoing development of the XB4 platform, Team XRAY continues to win at the highest competition levels including the European Championship. The XB4 is a multi-time European Champion as well the European Junior Champion.

EOS Champions.

XRAY XB4 has been one of the most successful 4WD off-road cars in the EOS racing series, winning 4 overall season titles. In 2019 it was again Bruno Coelho winning the 4WD Modified Class Championship in one of the most competitive race series in the world.

Chassis.

The chassis is revised to place weight further forward, with new side guard mounting positions for symmetrical flex, new fan holder mounting positions and multiple battery position choices to adjust the weight balance.

The new chassis features a more forward biased layout. Slipper/center, motor and battery were moved significantly forward to increase stability. The side guard mounting holes are now symmetrical for equal left-to-right flex characteristics.

The chassis features holes for a fan mount and multiple battery post positions to alter the pack’s location and adjust the F/R weight balance.

The chassis is an important component that contributes to the XB4’s handling characteristics. The chassis dimensions and flex characteristics are selected for the best blend of stability, traction and steering. The chassis is machined for extra clearance under the bulkheads to accommodate the diff height adjustment feature.         

CNC-machined from high-quality Swiss 2mm 7075 T6 aluminum, the chassis is strategically machined in low-stress areas to make it as light as possible without affecting strength or rigidity; and it is additionally black-coated for increased lifespan.

Chassis.

The chassis is revised to place weight further forward, with new side guard mounting positions for symmetrical flex, new fan holder mounting positions and multiple battery position choices to adjust the weight balance.

The chassis is revised to place weight further forward, with new side guard mounting positions for symmetrical flex, new fan holder mounting positions and multiple battery position choices to adjust the weight balance.

The new chassis features a more forward biased layout. Slipper/center, motor and battery were moved significantly forward to increase stability. The side guard mounting holes are now symmetrical for equal left-to-right flex characteristics.

The chassis features holes for a fan mount and multiple battery post positions to alter the pack’s location and adjust the F/R weight balance.

The chassis is an important component that contributes to the XB4’s handling characteristics. The chassis dimensions and flex characteristics are selected for the best blend of stability, traction and steering. The chassis is machined for extra clearance under the bulkheads to accommodate the diff height adjustment feature.         

CNC-machined from high-quality Swiss 2mm 7075 T6 aluminum, the chassis is strategically machined in low-stress areas to make it as light as possible without affecting strength or rigidity; and it is additionally black-coated for increased lifespan.

Chassis Layout.

The new chassis layout moves center diff/slipper, motor and battery significantly forwards and increases stability, allows more aggressive landings and makes the car more forgiving.

The new chassis layout was tested on all kind of surfaces to increase performance in every track situation. The center drive train and battery were significantly moved forwards compared to previous layouts.

Moving the weight balance to the front increases the stability and predictability on the track. Now the XB4 can be driven much harder and is more forgiving, which results in fewer mistakes and faster lap times.

Chassis Layout.

The new chassis layout moves center diff/slipper, motor and battery significantly forwards and increases stability, allows more aggressive landings and makes the car more forgiving.

The new chassis layout moves center diff/slipper, motor and battery significantly forwards and increases stability, allows more aggressive landings and makes the car more forgiving.

The new chassis layout was tested on all kind of surfaces to increase performance in every track situation. The center drive train and battery were significantly moved forwards compared to previous layouts.

Moving the weight balance to the front increases the stability and predictability on the track. Now the XB4 can be driven much harder and is more forgiving, which results in fewer mistakes and faster lap times.

Chassis Brace.

The front chassis T-Brace in Carpet edition increases front stability on high traction tracks and makes the car more predictable and easier to drive. The shorter graphite brace in Dirt edition is more flex to increase traction on low grip surfaces.

The front chassis T-Brace in Carpet edition increases front stability on high traction tracks and makes the car more predictable and easier to drive. The shorter graphite brace in Dirt edition is more flex to increase traction on low grip surfaces.

The rear graphite chassis brace is installed over the lower composite brace connected directly to the chassis. The graphite brace reinforces the rear of the car and generates more stability by increasing traction.

The chassis braces are a vital part of the Multi-Flex™ adjustability.

Chassis Brace.

The front chassis T-Brace in Carpet edition increases front stability on high traction tracks and makes the car more predictable and easier to drive. The shorter graphite brace in Dirt edition is more flex to increase traction on low grip surfaces.

The front chassis T-Brace in Carpet edition increases front stability on high traction tracks and makes the car more predictable and easier to drive. The shorter graphite brace in Dirt edition is more flex to increase traction on low grip surfaces.

The front chassis T-Brace in Carpet edition increases front stability on high traction tracks and makes the car more predictable and easier to drive. The shorter graphite brace in Dirt edition is more flex to increase traction on low grip surfaces.

The rear graphite chassis brace is installed over the lower composite brace connected directly to the chassis. The graphite brace reinforces the rear of the car and generates more stability by increasing traction.

The chassis braces are a vital part of the Multi-Flex™ adjustability.

Slipper One-way Clutch 2-in-1.

All-new unique Multi-Adjustable Slipper One-way Clutch features 2-in-1 functionality with the adjustable central slipper clutch and a new adjustable front One-way Slipper to lock-in the front end under acceleration and to adjust slipper off-power handling which influences how easy the car is on landing and under high-speed braking as well prevents traction roll at corner entry.

The Multi-Adjustable Slipper One-way Clutch pushes the carpet track performance of the XB4 to a whole new level. The clutch features 2-in-1 configuration that combines a central slipper clutch with a separately adjustable front one-way slipper.

The Multi-Adjustable Slipper with 2 pads controls the on-power handling of the car with a range from smooth up to aggressive acceleration.

The front one-way slipper features a separate slipper pad to control the one-way output to the front driveline. The smart design uses the one-way bearing lock-up under acceleration along with the main slipper setting to control power delivery like a traditional slipper for maximum traction and acceleration. Off-power, the one-way slipper setting controls the aggressiveness of high speed braking and how the car reacts on jump landings. With the front one-way slipper, the car dives less under heavy braking to improve corner entry without risking traction rolls. The one-way also makes the XB4 more forgiving of angled landings when trying to line up for a corner immediately after a jump.

 

Slipper One-way Clutch 2-in-1.

All-new unique Multi-Adjustable Slipper One-way Clutch features 2-in-1 functionality with the adjustable central slipper clutch and a new adjustable front One-way Slipper to lock-in the front end under acceleration and to adjust slipper off-power handling which influences how easy the car is on landing and under high-speed braking as well prevents traction roll at corner entry.

All-new unique Multi-Adjustable Slipper One-way Clutch features 2-in-1 functionality with the adjustable central slipper clutch and a new adjustable front One-way Slipper to lock-in the front end under acceleration and to adjust slipper off-power handling which influences how easy the car is on landing and under high-speed braking as well prevents traction roll at corner entry.

The Multi-Adjustable Slipper One-way Clutch pushes the carpet track performance of the XB4 to a whole new level. The clutch features 2-in-1 configuration that combines a central slipper clutch with a separately adjustable front one-way slipper.

The Multi-Adjustable Slipper with 2 pads controls the on-power handling of the car with a range from smooth up to aggressive acceleration.

The front one-way slipper features a separate slipper pad to control the one-way output to the front driveline. The smart design uses the one-way bearing lock-up under acceleration along with the main slipper setting to control power delivery like a traditional slipper for maximum traction and acceleration. Off-power, the one-way slipper setting controls the aggressiveness of high speed braking and how the car reacts on jump landings. With the front one-way slipper, the car dives less under heavy braking to improve corner entry without risking traction rolls. The one-way also makes the XB4 more forgiving of angled landings when trying to line up for a corner immediately after a jump.

 

Central Dogbone Drive Shafts.

The central drivetrain features new outdrives and dogbone driveshafts that offer reduced maintenance compared to previous CVD drive shafts.

The central drivetrain features new outdrives and dogbone driveshafts with longer lifespan and easier maintenance than previous CVD drive shafts. To accommodate chassis flex but to eliminate any excess play, O-rings are inserted inside the outdrives to support the driveshafts and to prevent damage from high impacts.

The rear center drive shaft is the same length for both Carpet and Dirt version. The front drive shaft for the Carpet edition is shorter due to the increased length of the One-Way Slipper assembly compared to the gear differential found in the Dirt edition.

Drive shafts are manufactured from world-renowned HUDY Spring Steel™ and feature 2.5mm drive pins for maximum drivetrain efficiency. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used in electric off-road cars. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

Central Dogbone Drive Shafts.

The central drivetrain features new outdrives and dogbone driveshafts that offer reduced maintenance compared to previous CVD drive shafts.

The central drivetrain features new outdrives and dogbone driveshafts that offer reduced maintenance compared to previous CVD drive shafts.

The central drivetrain features new outdrives and dogbone driveshafts with longer lifespan and easier maintenance than previous CVD drive shafts. To accommodate chassis flex but to eliminate any excess play, O-rings are inserted inside the outdrives to support the driveshafts and to prevent damage from high impacts.

The rear center drive shaft is the same length for both Carpet and Dirt version. The front drive shaft for the Carpet edition is shorter due to the increased length of the One-Way Slipper assembly compared to the gear differential found in the Dirt edition.

Drive shafts are manufactured from world-renowned HUDY Spring Steel™ and feature 2.5mm drive pins for maximum drivetrain efficiency. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used in electric off-road cars. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

Central Bulkhead.

To match the dimensions of the new one-way slipper, an aluminum central bulkhead and graphite top deck were redesigned for the Carpet edition.

Central Bulkhead.

To match the dimensions of the new one-way slipper, an aluminum central bulkhead and graphite top deck were redesigned for the Carpet edition.

Servo Mount.

The servo mount was redesigned to fit the new frontward chassis layout and features two aluminum stands with graphite stiffener from top.

Servo Mount.

The servo mount was redesigned to fit the new frontward chassis layout and features two aluminum stands with graphite stiffener from top.

Side Guards.

Side guards are updated to match the new chassis layout. The new version offers symmetric mounting positions on the chassis to ensure equal left-to-right flex characteristics.

Side guards are redesigned to match the new front chassis layout. The mounting points are on the chassis are now symmetrical, ensuring equal left-to-right flex.

Tough composite side guards perfectly fit the chassis to seal against dirt and protect from side impacts.

Molded from a hard composite material, the side guards are an important part of the chassis flex adjustment for the majority of track conditions.

To improve protection against dust, Velcro® double-sided tape is included to ensure a perfect seal of the body to the side guards, and to reduce the noise level of the running car.

Side Guards.

Side guards are updated to match the new chassis layout. The new version offers symmetric mounting positions on the chassis to ensure equal left-to-right flex characteristics.

Side guards are updated to match the new chassis layout. The new version offers symmetric mounting positions on the chassis to ensure equal left-to-right flex characteristics.

Side guards are redesigned to match the new front chassis layout. The mounting points are on the chassis are now symmetrical, ensuring equal left-to-right flex.

Tough composite side guards perfectly fit the chassis to seal against dirt and protect from side impacts.

Molded from a hard composite material, the side guards are an important part of the chassis flex adjustment for the majority of track conditions.

To improve protection against dust, Velcro® double-sided tape is included to ensure a perfect seal of the body to the side guards, and to reduce the noise level of the running car.

Suspension Arms.

Both Carpet and Dirt editions now feature the same length suspension arms. The front hard arms are shorter to increase stability and rear hard arms are longer for increased traction.

The Carpet and Dirt editions feature the same length suspension arms. The front arms are shorter to increase stability and rear arms are longer for increased traction.

Rear suspension arms accommodate the multi-adjustable uprights. The outer pivot of each arm uses small screws to secure the hinge pins and prevent separation in a crash. This floating hinge pin reduces suspension bind.

The suspension arm itself is rigid enough to provide a responsive feel, yet soft enough for extreme durability. The exclusive composite mixtures used for the suspension arms offer a perfect balance between reliability & performance.

There are two different suspension arms available: hard and graphite, each suitable for particular track conditions.

Suspension Arms.

Both Carpet and Dirt editions now feature the same length suspension arms. The front hard arms are shorter to increase stability and rear hard arms are longer for increased traction.

Both Carpet and Dirt editions now feature the same length suspension arms. The front hard arms are shorter to increase stability and rear hard arms are longer for increased traction.

The Carpet and Dirt editions feature the same length suspension arms. The front arms are shorter to increase stability and rear arms are longer for increased traction.

Rear suspension arms accommodate the multi-adjustable uprights. The outer pivot of each arm uses small screws to secure the hinge pins and prevent separation in a crash. This floating hinge pin reduces suspension bind.

The suspension arm itself is rigid enough to provide a responsive feel, yet soft enough for extreme durability. The exclusive composite mixtures used for the suspension arms offer a perfect balance between reliability & performance.

There are two different suspension arms available: hard and graphite, each suitable for particular track conditions.

Electronics Plate.

A handy, compact electronics plate for speed control mounting provides quick & easy removal and assembly. Redesigned to fit the new chassis layout and side guards, the plate is now mounted directly to the chassis instead of the side guards to reduce the impact on chassis flex characteristics.

Electronics Plate.

A handy, compact electronics plate for speed control mounting provides quick & easy removal and assembly. Redesigned to fit the new chassis layout and side guards, the plate is now mounted directly to the chassis instead of the side guards to reduce the impact on chassis flex characteristics.

Some information shown below may include details from previous kits,
and it may vary slightly from current kit specifications.

Bulkheads.

Front & rear bulkheads feature a horizontal split design (HS) to retain easy diff access while adding the valuable diff height adjustment. The unique design of the bulkheads uses an inline bushing to alter the alignment and height of the bevel drive gear. In addition to accommodating the diff height adjustments, it also allows the front central driveshaft to operate with a reduced angle for less friction and wear on the CV joint components and improved driveline efficiency.

The XB4 bulkheads allow fast and easy differential access for setup changes or servicing by removing only 4 screws from the upper gear box cover while the lower section remains mounted to the chassis. This super-fast diff access is featured on both front and rear gearboxes.

The super-strong, narrow bulkheads provide the needed clearance for the redesigned suspension holders with increased set-up range possibilities.

Diff Height Adjustment.

Front & rear HS bulkheads allow for diff height adjustment using eccentric bushings. In the front gearbox, the diff height has 3 different settings. The rear differential can be adjusted through a 5mm range. The diff height adjustment is a vital set-up capability that allows quick set-up adaption for either Carpet or Dirt tracks.

Carpet edition uses a lower ride height and the upper differential position to keep the drive shafts level.

Dirt edition typically uses a taller ride height and a lower differential position to keep the drive shafts level.

Diff Height Adjustment.

Central Drive Train.

The design of the HS bulkhead with the inline bushing for the bevel drive gear creates a more linear orientation for the front center drive shaft to reduce the CV joint angle for increased driveline efficiency and decreased friction and wear.  The height and angle of the rear center drive shaft is also adjustable depending on the height adjustment of the differential.

Front - there are 3 different angle configurations for adjustment of the front drive train.

Rear - there are 6 different height configurations for adjustment of the rear drive train.

Diff Gears.

The shorter pinion gear allows the drive shafts to move the CV joint closer to the differential to improve drive train efficiency.

Both crown gear and pinion gear are CNC-machined from HUDY Spring Steel and are ultra-hardened making them very strong and reliable with a longer life span. The split crown gear allows for a simpler exchange to optional gears without requiring a rebuild of the internal diff assembly and results in significantly lower rotating mass and improves the serviceability.

To improve the gear engagement both crown gear and pinion gear have more teeth and geometry that results in smoother engagement and increased efficiency.

Central Gear Differential.

The central differential is included in the Dirt Edition. The gear diff shares the same universal diff case and internal parts found in the front/rear differentials.

The maintenance-free, super-smooth gear diff has greater internal oil volume to increase consistency of the diff action and includes a composite case and cover with internal satellite gears that are precision-molded from special XRAY-developed graphite composite material, ensuring a long lifespan and super-smooth, efficient operation.

The differential outdrives are designed for use with 2.5mm driveshaft pins. The gear diff set includes an 81T spur gear and a 78T spur gear is available as an option.

The central differential is recommended for use on clay, bumpy Astro and low-traction tracks to increase traction.

Gear Differential.

The front and rear gear differential features a split design of the cover and crown gear. The differential case has greater internal oil volume to increase consistency of the diff action, yet it is significantly narrower and to move the rotating weight closer to the centerline.

The super-smooth, low maintenance gear diff includes a composite case and cover with internal satellite gears that are precision-molded from special XRAY-developed graphite composite material, ensuring a long lifespan and super-smooth, efficient operation.

Gear differential features all-new diff-outdrives designed for use with 2.5mm pin.

Spur Gear.

Precision-molded spur gears are made from XRAY's exclusive secret blend of composite material, allowing the gear to run true yet be robust enough to handle high-performance brushless motors. The spur gears are designed to have the lowest possible weight while staying strong and light. Each gear is stamped with the tooth number for easy identification.

The XB4 is equipped with an 81T spur gear which suits the majority of tracks. For additional tuning, optional 75T, 78T, 84T and 87T spur gears are available.

Motor Mount.

The motor mounting plate features a shape for easier access to the pinion gear set screw. The inner motor screw is recessed into the mount for improved clearance around the center spur gear.

The motor is connected to an eccentric mounting plate, with the assembly then inserted into an integrated motor holder/drivetrain support. The design allows quick & easy motor rotation to adjust gear mesh, and still securely holds the motor plate using only a single screw.

To ensure the motor will not loosen in a serious crash or due to insufficient tightening, the motor plate has a bayonet mounting system which prevents it from being dislodged from the motor holder. By rotating the motor mount plate to the opposite direction, the motor can be quickly removed from the vehicle.

Removing the motor or adjusting the gear mesh is easy and fast, with changes possible in only a few seconds.

Motor Bulkhead.

The lowered motor bulkhead reduced the CG of the motor and central slipper clutch/diff, improving cornering speed and stability.

Machined from the premium Swiss 7075 T6, the motor bulkhead is strong and lightweight.

Shock Towers.

Front & rear shock towers fits the Horizontal Split Bulkheads (HS) and feature denser upper shock mount positions for more precise set-up adjustments.

The rear shock tower features extra roll center positions for precise set-up adjustment and extra wing mounting positions.

Both front & rear shock towers are machined from premium-grade graphite and are lightweight & strong, with multiple shock positions and roll center adjustment positions.

Shocks.

The front shock absorber bodies and shock shafts are shorter by 2mm than previous design. Combined with the shock towers and suspension geometry, these changes increase stability and improve cornering speeds.

The big-bore shocks are membrane free, but still allow for easy, consistent building and rebound control using a bleed-screw shock cap design.

The aluminum body and lower cap are all machined from premium Swiss 7075 T6 aluminum.

The shock shafts are machined from special steel material, precision hand-ground for maximum smooth operation, and additionally hardened for increased lifespan.

Shock Pistons.

Shock pistons are made from Delrin® and are molded using ultra-high precision molds. All-new 2-hole pistons (1.6mm and 1.7mm holes) are now included in the set.

Shock Springs.

Both Carpet and Dirt edition include shock springs selected for the specific track conditions.

There are two types of springs offered:

  • Linear – The spring rate is constant during the entire spring compression. Springs with different linear spring rates are available as optional tuning parts.
  • Progressive - The main advantage & benefit of progressive springs is that as the car initially enters the corner the springs work like softer springs to provide maximum traction. As the chassis begins to roll in the middle of the corner, the spring rate progressively increases until it works like a stiffer spring which allows the car to maintain maximum cornering speed.

XB4 springs, like all other XRAY springs, are manually measured, selected, and matched into pairs to guarantee precisely equal length and damping characteristics.

Each spring is laser-engraved with stripes to indicate the firmness, the more strips, the stiffer the spring.

Drive Shafts.

The front and rear driveshaft lengths are updated to match the new differential width and suspension geometry; the front drive shaft is 83mm long and the rear drive shaft is 75mm long.

The safety collar on the front driveshaft secures the pin, while the ball bearing captures the pin in rear axles, both preventing the pin from coming lose during a run.

XB4 constant velocity drive shafts are manufactured from world-renowned HUDY Spring Steel™ and feature 2.5mm drive pins for maximum drivetrain efficiency. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used in electric off-road cars. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

I.S.S.™ Suspension Holders.

The rear suspension holders can be installed in upward or downward orientations, resulting in additional roll center locations for the inner hinge pins.

The downward orientation of the suspension holder is used primarily for Dirt tracks.

The upward orientation of the suspension holder is used primarily for Carpet tracks.

The suspension holders allow use of both the long or standard suspension arm configurations.

Machined from premium Swiss 7075 T6 aluminum and black coated.

Suspension.

The correct suspension geometry is one of the most important features of any RC model car, while at the same time being one of the most difficult and challenging features for a designer.

 

The suspension is always a mixture of:

• design and shape of individual suspension parts

• flex and hardness

• materials used

• mounting system

• geometry and position of mounting points of connecting parts

 

From the suspension arms, through the suspension blocks, to the light yet robust steering blocks, every suspension part has been specially designed for the 1/10 off-road racing platform to provide responsive racing characteristics in all conditions. 

Rear Uprights.

The multi-adjustable rear uprights allow for super fine tuning of the suspension geometry.

The upper roll center is adjusted at the camber linkage via shims (up/down & in/out), while the lower roll center is adjustable via eccentric inserts for 9 different positions (up/down & in/out).

The multi-function uprights have the upper roll center position in the middle of the axis of the driveshaft joint to help generate more traction and increase stability.

There are three different uprights available: hard (included), graphite (optional), and aluminum (optional), each suitable for particular track conditions.

Wheel Hubs.

Ultra-lightweight 12mm wheel hex drive hubs are CNC-machined from Swiss 7075 T6 black-coated aluminum. These ultra-true hex hubs have a clamping design which ensures ultra- solid mounting of the wheel on the hub.

The rear alu hex hubs are specially machined to reduce rotating weight while guaranteeing wobble-free wheel mounting.

To adjust track-width, optional offset wheel hex drive hubs are available.

Wheelbase Adjustment.

Suspension arms allow for quick & easy wheelbase adjustment. Using included 2mm shims, both front and rear suspension arms can be moved either forward or rearward to adjust weight balance depending on track conditions.

By moving the arms to the front, the balance and weight of the car are transferred more to the rear; this is recommended for medium- and high-traction conditions.

By moving the arms to the rear, the balance and weight of the car are transferred more to the front.

Anti-roll Bars.

Both Carpet and Dirt edition include anti-roll bars selected for their specific track conditions.

Anti-roll bars are manufactured from special spring steel material and are used to stabilize the front & rear ends of the car. The roll bars are easily mounted to the diff cases and can be adjusted with the linkages.

Front & rear anti-roll bars are interchangeable since they have same design and shape. The thickness of each anti-roll bar is laser-engraved for easy identification. Anti-roll bar wires of different thickness are available separately for fine-tuning.

Steering System.

The dual arm steering system is simple yet effective, and features an easily adjustable integrated servo saver. Ackermann is easily adjusted by quickly changing the steering link mounting positions on the steering plate.

Bump steer is adjusted for more aggression by inserting a shim between the steering block and steering linkage.

Steering Blocks.

The tiny yet tough steering blocks are molded from a special composite mixture for maximum strength.

Composite steering block inserts allow for very quick & easy lower roll center adjustment. With additional shims and extra inserts, fine tuning the roll center is easily achieved.

For maximum drivetrain reliability, larger 5x12 ball-bearings are used in the outer position with increased dynamic load. On the inner position, the smaller 5x10 ball-bearings are used for minimized unsprung weight. 

Caster Blocks.

The 1-piece caster blocks are very lightweight, yet the construction makes them very stiff and rigid. The non-adjustable caster angle is preset to 9°. Roll center position can be quickly & easily adjusted by inserting different thickness of shims atop the caster block (between the block and the vertical ball stud).

The non-adjustable caster is preset to 9°, however the position of the adjustable eccentric bushings in the I.S.S.™ suspension holders influences the caster as well. (For example, if the eccentric bushings have the roll center in middle position, the caster angle is 9° which when added to the 9° caster block gives a total of 18° caster. The total adjustability range for caster is 16-20°.)

Optional caster blocks with 6° and 12° built-in caster angles are available for further suspension geometry adjustment.

There are four different caster blocks available: medium (optional), hard (included), graphite (optional) and aluminum (optional), each suitable for particular track conditions.

The new hard caster blocks increase stability in high-traction conditions, and help to increase cornering speed.

Battery Holder.

Tweak-free Quick Battery Holder allows for easy retainer height adjustment for more convenient battery mounting. The entire system is intended to reduce the effects of the battery and holder on chassis flex, making the XB4 more predictable and easier to drive.

The battery holder is universal for both Dirt and Carpet edition.

Body Posts.

Rear body mount feature more frontward position and fit the rear Horizontal Split Bulkhead (HS) and the latest body. The shape of the holder allows for super easy access to the screws on the upper part of the bulkhead. Machined from premium graphite material.

Beefy 6mm thick body posts are made from a special composite material for maximum strength. The body supports are rounded to have a better fit and provide better support for the car body.

Turnbuckles.

To guarantee maximum reliability, all turnbuckles are manufactured from special HUDY Spring Steel™ material for turnbuckles which features a tougher core. These turnbuckles are used for front & rear upright linkages, steering system, and also for the servo saver.

High Traction Body.

The XB4 Carpet and Dirt Editions each feature specifically designed XRAY Gamma bodies with super-smooth airflow and revised downforce characteristics fine-tuned for their intended conditions.

The Carpet edition of the Gamma body is designed especially for high traction conditions and improves the stability in the fast corners, chicanes and improves rotation in tight corners.

The Gamma Carpet body is also available in lightweight version.

Low Traction Body.

The Dirt edition of the XRAY XB4 Gamma body is designed for low traction conditions. The design improves the stability and increases traction.

The Gamma Dirt body is also available in lightweight version.

Body Seal.

To improve protection against dust, Velcro® double-sided tape is included to ensure a perfect seal of the body to the side guards, to reduce the noise level of the running car.

Rear Wing.

The Carpet and Dirt Editions of the XB4 each feature an individually paired wing to work with their particular body. Made from strong Lexan™ material, the wing is supported on the wing mounts by extra flat shims to better support and extend the life of the wing.

Various wing designs in different thickness are available separately. The thicker wing gives higher traction and stability but gives reduced steering.

Wheels.

The included wheels are IFMAR standardized with the wheel hex offset. The wheels feature a redesigned countersunk center area to allow the wheel nut to sit deeper in the wheel.

The wheels are perfect for high-competition racing. They feature internal reinforcement ribs to provide stability and resist deformation, yet they are made from a flexible material to provide durability and withstand impacts.

The side of the wheel is aerodynamic for maximum performance. The wheels were designed to provide maximum traction.

The wheels feature a 12mm internal hex.

XRAY Instruction Manual.

The Instruction manual is universal for both Carpet and Dirt edition and features a list of any important optional parts suggested for fine set-up adjustments.

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.

Download the new Instruction manual here: XB4´21 Instruction Manual

Ball-bearings.

All-new larger ball-bearing used in the rear uprights for increased reliability. The XB4 features greased ball-bearings for front steering blocks & rear uprights to increase lifespan in dusty conditions. The remaining bearings are degreased and oiled with AeroShell® Fluid 12 for maximum smoothness and long life.

A full set of high-speed ball-bearings are used throughout the drivetrain to ensure maximum 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.

HUDY Chem Series.

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.

HUDY Chem Series.

Chassis Balance.

The chassis design focuses on balanced weight distribution and weight transfer. The chassis features pre-drilled holes for additional weights for optimum car balancing. Centerline holes are pre-drilled for easy balancing with the HUDY Chassis Balancing Tool #107880.

Adjustment Possibilities.

The extensive and impressive range of adjustment possibilities includes: caster, camber, toe, kick-up, anti-squat, ride height, downstops, track-width, lower roll center, upper roll center, roll center positions, bump steer, wheelbase, Ackermann, adjustable shocks, adjustable front and rear diff and adjustable XRAY Multi-Flex™.

Set-up Book.

The XB4 is one of the most adjustable electric off-road car in the world. Whether you are a hardcore racing fanatic or a club-level sportsman, you can very easily adjust the XB4 to suit your racing style, race track type, and all track conditions. To fully understand the set-up possibilities we recommend the legendary HUDY Set-up Book, loaded with over 40 pages of high-quality pictures and easy-to-understand RC car set-up explanations. Whether you are a novice driver or experienced racer, you can easily learn many set-up tips & tricks and improve your set-up skills, ultimately translating into improved racing performance with your XB4. The HUDY Set-up Book is available for download exclusively at www.hudy.net

XRAY VIP Customer Treatment.

Owning an XRAY model racing car is an experience on its own. 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 Support Forum. 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.

Philosophy.

At the heart of XRAY's philosophy is a firm commitment to perfection in engineering, design, performance and support… all made possible by state-of-the-art in-house manufacturing. The XB4 is the epitome of perfection that is typical for XRAY.

Dipl. Eng. Juraj Hudy
XRAY Chief Designer

Development.

Successful development of the XB4 – like all other XRAY platforms – would not have been possible without the involvement of the entire racing team constantly working to test new ideas, prototypes, and improvements.

Commitment.

“Being part of the R&D team, I know how much time, energy, and effort is put into developing all of our cars. Chasing perfection is a never-ending process, and as such we strive to bring you an improved & better-handling XB4. You will be amazed by the handling & reliability improvements of the new XB4, which will help bring you to the Winners’ Circle.”

Martin Bayer
XRAY Factory Team driver
European Champion

Designing & Making of XB4.

Read the exclusive story about the designing and making of the XRAY XB4.

Perfection.

Designed in virtual reality using the world's most sophisticated CAD tools, and manufactured using the world's best machining and molding machinery, the XB4 achieves a level of perfection in all details that is second to none.

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