XRAY ’24 XB4 1/10 4WD Off-Road Buggy

XRAY ’24 XB4 1/10 4WD Off-Road Buggy

From XRAY:
XRAY XB4’24 All-new Features:

  • Redesigned chassis offers short and long configurations to adjust wheelbase and weight balance to match any track conditions
  • Front & Rear LSM arms in Medium composite provide better crash durability and are suitable for all conditions
  • Steering Blocks & C-hubs are also moulded from new medium composite hardness for extra reliability and crash resistance
  • New rear uprights feature lowered roll center positions to improve stability and reduce suspension collapse in high speed corners
  • All-new big bore 13.2mm shock design features new shock bodies, 2.0 and 2.5mm piston choices, shock caps, nuts and shock shafts.
  • The 13.2mm shocks use a new X-ring design for improved seal without excess friction for improved shock operation
  • New conical springs have been selected to work with the new 13.2mm shock package
  • Front shock tower with wider positions increases the set-up adjustment range for different track conditions
  • The rear shock tower with lowered shock positions improves roll characteristics and increases cornering speed
  • Redesigned side guards reinforce the rear section of the chassis
  • Front and rear differentials at XB4C use steel satellite gears for improved efficiency and increased lifespan
  • New ‘Lush’ rear wing with significantly increased lifespan improves airflow and maintains chassis attitude over large jumps while improving traction in all conditions
  • 30mm Fan Holder for additional ventilation

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.

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.


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

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.


The XB4 platform works at the highest competition level in any track conditions, whether it be super-low-traction dusty tracks, medium-traction, or super-high-traction carpet or astro turf; there is an XB4 for you that will handle flawlessly in any of these conditions.

There are two different XB4 kits to choose from – Carpet Edition and Dirt Edition, both built on the same platform with full compatibility with interchangeable parts.

The Carpet Edition is designed for medium to very-high traction conditions, while the Dirt Edition is designed for very-low to medium traction conditions.

zThe Uni-Platform™ allows either version of the XB4 to be tuned or converted to suit any track conditions with only a few additional parts.


The new chassis plate includes multiple mounting positions for the rear transmission for a standard or short position to adjust handling to match any track condition.


The new chassis plate includes multiple mounting positions for the rear transmission for a standard or short position to adjust handling to match any track condition.

Standard transmission position is suitable in high traction conditions to improve stability.

Shorter transmission position is suitable for lower traction surfaces to increase rear traction.

Side Guards.

The updated side guard design adds additional rear attachment points that increase chassis stiffness.

Gear Differential.

The gear diff in XB4C now includes steel satellite gears for improved efficiency and increased life span. Gear diff in XB4D includes graphite gears for improved traction and acceleration on lower traction surfaces.

Suspension Arms.

Suspension arms are molded from a new medium hardness composite mixture to improve reliability and strength. The medium composite provides excellent performance on a variety of conditions with the added benefit of increased strength.

Steering Blocks.

Updated steering blocks in a new medium hardness material improve both handling and reliability.

Caster Blocks.

Caster blocks made from a new medium hardness material improve reliability. Different caster blocks hardness choices are available to tune set-up for any track condition.

Rear Uprights.

The XB4C comes with new rear uprights with Lower Roll Center Positions to improve stability with less collapse of the suspension in high-speed corners on Carpet or Astro.

The XB4D comes with both uprights with Lower & Higher Roll Center Positions. The lowered roll center uprights are suggested for Astro and high roll center uprights are suggested for dirt conditions.

Big Bore Shocks.

All-new big bore 13.2mm shocks improve handling, landing, and bump absorption. New X-rings provide smooth operation & dust resistance. Two different piston thicknesses are included in the kit for tuning along with piston blanks for additional tuning possibilities.

Shock Pistons.

The new piston choices were updated for ideal fit and dampening in the new big bore shock bodies. All-new 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.

Shocks Springs.

A completely new range of conical springs are available for the big bore shocks. Carpet and Dirt edition include 2 complete sets of springs chosen for their intended track conditions. The spring rates are more closely spaced to give smaller tuning increments that allow for easier shock tuning.

Shock Towers.

Redesigned shock towers compliment the new big bore shocks. The front tower is wider to increase the set-up options for all different track conditions. The new rear tower lowers the shock positions for reducing chassis roll.


A new rear wing generates more traction, provides better jump stability, and significantly increases lifespan. The wing features pre-marked mounting holes for easy installation and is included in both Carpet & Dirt Edition.

Motor Cooling.

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.

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

Chassis Layout.

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.

Motor Bulkhead.

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.

Motor Mount.

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.

High Traction Body.

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 lightweight version.

Low Traction Body.

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 lightweight version.

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 traction surfaces.

Slipper One-way Clutch 2-in-1.

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.

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.

Central Dogbone Drive Shafts.

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

Central Bulkhead.

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

Servo Mount.

The servo mount fits the frontward chassis layout and features two aluminum stands with a graphite stiffener from top.

Electronics Plate.

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.


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.

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.

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.

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.

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.

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.


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.


“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

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.


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.

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.

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.


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.


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.

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.

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.

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.

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.
Visit TeamXRAY.com
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Updated: December 15, 2023 — 4:49 PM
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