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.

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 its products. The XB4 is created by XRAY’s design staff using premium European materials and sophisticated German and Swiss machines.

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.

The chassis is updated to match the new front bumper design that improves clearance and reduces contact with the track surface.

The new front bumper is now perfectly aligned with the chassis plate, allowing for a lower ride height without the bumper extending below minimum clearance requirements. The lower ride height helps improve handling on high speed and high traction surfaces, and the improved clearance means less chance for upsetting the buggy’s stability on jumps and landings, all of which contributes to faster lap times and more consistent results.

The chassis plate includes multiple mounting positions for the rear transmission to adjust wheelbase.

Both a standard and a short position can be used to adjust handling to match any track condition.

The standard transmission position is suitable for high traction conditions to improve stability (XB4C).

The shorter transmission position is suitable for lower traction surfaces to increase rear traction (XB4D).

The chassis features symmetrical flex and multiple battery position choices to adjust the 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.

The new A & B front suspension holders are now 3mm wider to increase corner speed, drivability, as well as help improve the jumping and landing of the car. The drivability is significantly improved, but most importantly, leads to faster and more consistent lap times.

The wider C & D rear suspension holders are also included as standard, improving on-power stability as well as drivability.

The front and rear geometry updates work together to improve the balance between responsiveness and stability.

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 rear suspension holder is used primarily for Dirt tracks.

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

Machined from premium Swiss 7075 T6 aluminum and black coated.

Both Carpet and Dirt versions feature longer 84mm front drive shaft to accommodate the wider front suspension geometry.

The XB4C includes ECS drive shafts that help improve cornering speeds on higher traction surfaces.

The XB4D includes CVD drive shafts that help generate steering and increase forward drive on dirt tracks.

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.

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

The central drivetrain features outdrives and dogbone drive shafts 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 drive shafts and to prevent damage from high impacts.

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.

The chassis plate features multiple rear transmission mounting positions, creating a short or standard wheelbase adjustment to adapt the XB4 handling to any track condition.

Standard wheelbase position is suitable in high traction conditions to improve stability (XB4C).

Short wheelbase position is suitable for lower traction surfaces to increase rear traction (XB4D).

All-new 3.5mm Heavy Duty Turnbuckles together with the new 5.4mm Heavy Duty Ball Joints and Ball Ends ensure super strong and more reliable steering & camber links. The new composite ball joint design reduces bind for smooth suspension and steering movement.

The ball joints increased to 5.4mm instead of the previous 4.9mm. There are two different ball joint shapes: one straight and one curved for improved clearance around the front spring and wheel. The ball joints are slightly longer so the turnbuckle thread deeper in the ball joint to improve reliability and prevent deformation of the plastic at the weakest point at the end of the turnbuckle thread.

The steel turnbuckles increased from 3.0mm to 3.5mm to increase durability.

The new 5.4mm ball ends’ height was increased by 1.0mm to improve the range of motion of the joint. The complete 5.4mm assembly is smoother and more reliable.

Front suspension arms are molded from a Graphite composite mixture for the Carpet version, and a Hard composite mixture for the Dirt version, each particularly suited for their specific version.
Graphite arms provide the best response and cornering speed for the higher traction carpet conditions.
Hard arms provide better mechanical traction and more forgiving handling for loose dirt conditions.

There are three different suspension arm materials: medium, hard and graphite, for maximum tunability for different track conditions.

New rear suspension arms add an extra inner shock mounting position. The geometry achieved with this inner shock location combined with the wider C&D suspension holders and short suspension arms helps generate more traction and improve rotation.

Graphite arms provide the best response and cornering speed for higher traction carpet conditions (XB4C).
Hard arms provide the best mechanical traction and forgiving handling for loose dirt conditions (XB4D).

XRAY’s unique lower shock mounting adapters offer two mounting alternatives to create different stability characteristics while lowering the overall shock placement and CG. The inner shock mounting position increases reactivity of the car, while the outer position increases stability. The Shock Mounting Adapters are suggested for higher traction conditions and as such are included in XB4C only.

The included steering blocks are moulded from the Graphite composite mixture to increase steering response.

The new steering block features carbon fiber extension plates for easy adjustment of the steering characteristic. The steering block comes with a 2 dots extensions. Optional 1 dot and 3 dots extensions are available to alter the steering characteristics.

There are four different steering block materials – medium (option), hard (option), graphite (included) and aluminum (option) – which can be used to fine tune the steering response for various track conditions.

The tiny yet tough steering blocks are molded from a special graphite 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, large 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. 

Both XB4 versions feature caster blocks moulded using the Graphite composite mixture to improve handling. The stiff and light material improves consistency and steering response. Different caster blocks hardness choices are available to tune set-up for any track condition.

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 on top of 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 influence 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°, 7° and 12° built-in caster angles are available for further suspension geometry adjustment.

There are four different caster block materials – medium (option), hard (option), graphite (included) and aluminum (option), each one suitable for different track conditions.

Completing the suspension hub update, the rear uprights with lower roll center positions are also molded from a Graphite composite mixture material. The hub geometry improves performance, rear end stability, and helps to reduce suspension collapse in high-speed corners.

Optional rear uprights with higher roll center positions are available for lower traction conditions.

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 drive shaft joint to help generate more traction and increase stability.

There are four different upright materials available: medium (optional), hard (optional), graphite (included), and aluminum (optional), as well as the High Roll Center uprights (optional), each suitable for particular track conditions.

The Carpet and Dirt version each feature a different steering plate.

The XB4C includes an aluminum steering plate, while the XB4D comes with the Graphite composite steering plate. Each steering plate is carefully chosen to maximize performance for each kit’s particular requirement.

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

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

Shock towers feature new lowered geometry in both front and rear. Lowering the shocks increases stability, cornering speed as well as gives a lot more precise feeling. As a result of the speed of the cars and tracks’ grip levels increasing, the shocks were lowered to increase the stability and improve the overall handling of the car. 2dot front and 3dot rear shock towers are included.

Both front & rear shock towers compliment the new big bore shocks and suspension changes on the new XB4.

Front & rear shock towers are machined from premium-grade carbon that is lightweight & strong, with multiple shock and roll center adjustment positions.

The shock towers are universal for both Dirt and Carpet edition.

The new big bore 13.2mm shock bodies and shock shafts have been shortened to match the lower shock towers and achieve the desired geometry while maintaining proper suspension travel.

The improved shocks improve overall handling, jump landings, and bump absorption.  The X-rings provide smooth operation & superior dust resistance. Two different piston thicknesses are included in the kit for tuning along with blank pistons for additional tuning possibilities.

The big bore shocks improve landings and provide better control over surface unevenness and bumps to improve traction.

There are two different thickness pistons (2.0 and 2.5mm) included in the kit in pre-drilled and blank alternatives.

The super-efficient pre-oiled X-rings ensure smooth operation and prevent dust inside the shock assembly.

The shock absorbers are universal for both Dirt and Carpet edition.

The all-new spring collars and lower ball joints are available in various sizes to allow easy adjustment of ride height and droop.

The spring collars are available in 3 different heights: 0mm, -2mm and -4mm. This allows for a wider range of ride height adjustments without changing spring lengths to achieve a desired ride height. Using a lower collar will lower the minimum ride height for a given spring.

The ball joints are available in 3 different lengths: 0mm, +2mm and +4mm. This allows for a convenient droop setting. Using a longer ball joint will increase the overall shock length and will increase the suspension droop at full extension.

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.

The aluminum monoblock one-piece servo holder features a more rigid and flex-free servo attachment. The holder is mounted using only 2 screws along the chassis centerline, ensuring equal left-to-right flex. The ultra-strong construction offers exceptional durability.
Mounted with 2 screws along centerline for improved side to side chassis flex.
Ultra-strong construction provides very long life and durability in even the most extreme racing conditions.
Machined from premium Swiss 7075 T6 aluminum and black anodized.

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 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.

The XB4C now includes the lightweight version of the Delta 4C body. This helps with lowering the CG and improving the overall handling of the car.

The XB4 Carpet and Dirt Editions each feature XRAY Delta bodies with narrower front and rear sections matching the chassis & side guards.

XRAY Delta bodies feature super-smooth airflow and appropriate downforce characteristics fine-tuned for their intended conditions.

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

The Delta Carpet body is also available in thicker version.

The XB4D now includes the lightweight version of the Delta 4D body. This helps with lowering the CG and improving the overall handling of the car.

The Dirt Edition Delta body incorporates the same narrowed front & rear sections that follow the shape of the chassis & side guards.

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

The Delta Dirt body is also available in thicker version.

The included HARD wheels are IFMAR standardized with the wheel hex offset and offer better traction and car control in high-competition racing. The wheels feature a redesigned countersunk center area to allow the wheel nut to sit deeper in the wheel.

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.

The optional cooling fan is mounted via a specially designed composite holder that is mounted only through one screw and a centering pin to minimize vibrations and increases fan lifespan.

The side guard design adds additional rear attachment points that can increase chassis stiffness when screws are installed, expanding the range of chassis flex settings possible on the XB4.

The chassis guards have a narrow front profile and chamfered edges to reduce chassis scrub on jump entry, significantly improving consistency and handling over jump features.

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 most 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.

Chassis layout offers the ability to place the motor and central assembly in a front or rear position to alter the weight balance depending on the track conditions.  The chassis layout was tested on all kind of surfaces to increase performance in any track situation.

Narrow motor bulkhead positions the motor towards the chassis centerline for proper weight balance. The lower design of the motor mount also reduces the CG for better controlled chassis roll.

Matching the motor bulkhead, the motor mount plate is small and light to reduce weight yet still offer the necessary adjustment range for motor installation. 

The motor mounting plate features a shape for easy 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.

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 traction 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.

Unique Multi-Adjustable Slipper One-way Clutch features 2-in-1 functionality with the adjustable central slipper clutch and an 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 an adjustable central slipper clutch with a separately adjustable front one-way slipper.

The primary 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 slipper also makes the XB4 more forgiving in sideways landings when trying to line up for a corner immediately after a jump.

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

A handy, compact electronics plate for speed control mounting provides quick & easy removal and assembly. Redesigned to fit the 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.

The piston choices were designed for ideal fit and dampening in the big bore shock bodies. 2-hole pistons (1.6 and 1.8mm) are included in 2.0mm or 2.5mm thickness alternatives. In addition, two sets of blank pistons in both thickness alternatives are included for individual custom modification.  All pistons are made from Delrin and are molded using ultra-high precision moulds.

A complete range of conical springs are available for the big bore shocks.

Carpet and Dirt edition include springs chosen for their intended track conditions.

The 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 clearly indicate its firmness.

4dot-4dot included in carpet

3dot-2dot included in dirt

A rear wing is included in both Carpet & Dirt editions. The “Lush” rear wing has high levels of downforce & low drag to improve overall performance. The wing generates high levels of traction but maintains easy jumping characteristics. The wing has pre-marked mounting holes and a design that significantly increases lifespan.

Made from strong Lexan™ material, the wing is supported on the wing mounts by extended flat shims to better support and extend the life of the wing. Lush Thick wing is available as option for even better toughness.

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.

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.