XRay XB8 2025 4WD Nitro Off-Road Buggy Kit XR350020

XRAY XB8’25 All-new Features

• New front and rear shock towers improve suspension geometry for reduced roll & increased corner speed
• New shorter front and rear shocks were updated to accommodate the new suspension geometry for reduced roll & increased corner speed
• Split radio box ensures perfect left to right side flex that helps to generate more overall traction
• Updated chassis with split radio box provide significantly improved & perfectly balanced side-to-side flex
• Front and rear gearbox covers with provisions for the new anti-roll bar centering holders
• New 3 dots carbon steering plate improve Ackermann settings for smoother steering feel
• Stronger front upper arm holder with a stronger, more rigid design
• 1 slot offset rear wheel hubs are now included as most favorite choice for most track conditions

Heritage

“I designed and hand-made my first off-road cars back in 1986, and they were dominating the races thanks to unbeatable reliability and best performance. Years later in 2004 we have started our first mass production XRAY XB8 platform based on our long-term experiences, knowledge, and R&D expertise gained over decades, taking over the heritage I brought with me.

Since the release of the XB8 platform, we have continued our dedicated work to refine the platform annually to bring the latest improvements & innovations to make the XB8 stand out in crowd and take you to the Winners Circle.”

Dipl. Eng. Juraj Hudy
XRAY Chief Designer

Chassis

The chassis plate is updated for the new split radio box mounting configuration that helps to significantly improve overall traction and ensures perfect & balanced side-to-side flex.

The chassis is an important component that affects the XB8’s handling characteristics. The chassis’ dimensions and flex characteristics are selected for the best blend of stability, traction, and steering.

The chassis is CNC-machined from  high-quality 3mm Swiss 7075 T6 aluminum; strategically machined in low-stress areas and then anodized to make it as light as possible without affecting strength or rigidity.

Radio Box

The radio box features new split design that ensures a perfect left to right side flex characteristics that helps to generate more overall traction. All the electronics are mounted inside of the temperature resistant Hard composite box. This flex configuration and material composition improve the overall traction of the car.

The radio box is fitted to the chassis with three screws in front and three screws in the rear to achieve perfect stability for the servo mounting. To facilitate easier handling, the front and rear sections of the box are connected at the bottom.

The electronics assembly is very compact and can be quickly & easily removed for servicing and cleaning. It requires removing only a few screws from the bottom of the chassis to remove the entire electronics assembly from the car.

The large, molded radio box features a very clean design and layout that places the weight in key areas for proper balance. The batteries are placed along the front centerline of the chassis, while the lighter receiver is placed on its side at the rear. The easy-access radio box is mounted on the side of the car and is secured by the fewest possible screws.

Shock Towers

New Swiss 7075 T6 aluminum shock towers feature lowered shock mounting positions for both the front and rear suspension. The lower mounting positions increase the overall stability of the car across all surfaces, as well as help increase cornering speeds. By carefully selecting the new tower geometry, the single row of shock mounting positions simplifies the set-up process to optimize performance for any track condition.

The front & rear shock towers are CNC-machined from 4mm Swiss 7075 T6 aluminum for strength and durability. The front shock tower features 4mm shock mounting holes for increased durability and rigidity.

Shocks

The new XB8 shock bodies and shock shafts were shortened to match the new lowered shock towers and lowered mounting geometry, while maintaining proper suspension travel.

The shorter XB8 shocks carry over multi-adjustable 3-in-1 shock caps with 4 bleed holes with 3 different seal choices – ribbed membrane, cell membrane, or O-ring. The shorter shocks feature 3 different assembly alternatives – emulsion / rebound / zero rebound, with each one suitable for different track conditions.

The lower shock ball joint features a lock extension that fits into the lower collar, reducing the chances of the retainer separating from the ball joint and unseating the spring in a crash.

Oversized big-bore shocks featuring 16.2mm I.D. shock bodies and are externally threaded with an adjustable collar for quick & easy spring preload adjustment. The shock bodies are hard coated in a titanium color and feature a 1-piece aluminum lower cap.

The XB8 comes with 4 Dots front springs and 3 Dots short (82mm) rear springs.

Shock Cap 3-in-1

3-in-1 shock caps allow assembly in 3 different configurations – emulsion / rebound / zero rebound, to match shock dampening characteristics to various driving styles and different track conditions.

The Emulsion configuration uses an O-ring to seal cap to body, mixing oil and air inside the shock. Typically provides excellent traction on a variety of surfaces and is suggested as a starting point for most typical track conditions.

The Rebound alternative using the cell membrane is best matched to lower traction and flat slippery tracks. This shock set-up has the most rebound out of the three build options.

The Zero Rebound configuration created by using the ribbed membrane is better suited for super bumpy tracks. This set-up has no rebound.

Diff Bulkheads

The new front & rear gearbox front cases were modified with provisions for the anti-roll bar centering collars. The new anti-roll bar collars minimize unwanted movement and improve the precision of the anti-roll bar functionality.

Front & rear bulkheads feature a semi-split design for easy diff access while adding the valuable diff height adjustment. The bulkhead also aligns the front central driveshaft with a reduced operating angle for less friction and reduced wear on the CV joint components and improved driveline efficiency.

The XB8 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 with the lower arms and suspension holders installed. This super-fast diff access is featured on both the front and rear gearboxes.

Anti-Roll Bars

To increase overall traction in all track conditions, the front anti-roll bars used are 2.2mm and the rears to 2.4mm.

Anti-roll bars, manufactured from spring steel material, are easily mounted to front & rear diff cases with easy adjustment using the adjustable linkages.

Anti-roll bar wires of different thicknesses are optionally available for fine-tuning.

Steering Block

Steering blocks feature all-new steering geometry thanks to all-new 3 dots carbon steering plates. The new geometry helps to improve stability and cornering speed and features also increased Ackermann, with the outside wheel turning less, which yields improved drivability and lowered lap times.

Steering blocks from hard composite material provide responsive feel especially on bumpy tracks and retain free suspension movement in dusty conditions for better consistency.
The steering blocks are super lightweight yet extremely strong, featuring a larger outside 8x16x5mm ball-bearings for increased reliability and lifespan.

Ackermann

The all-new 3 dots carbon steering plates update Ackermann geometry, improving the stability and cornering speed of the car. The new geometry features increased Ackermann, with the outside wheel turning less, which yields improved drivability and lowered lap times.

The specially designed ball studs increase steering lock and allow greater steering radius. The integrated backstops ensure that the pivot balls do not disconnect in crashes.

Ackermann can be easily adjusted on the machined Swiss 7075 T6 steering plate as well to ensure highest reliability and strength.

Suspension Holders

The front upper arm suspension holder was updated and redesigned for increased strength and rigidity. Front & rear suspension holders for semi-split bulkheads feature a wide range of set-up adjustments.

Each aluminum suspension holder feature Integrated Suspension Settings™ (I.S.S.) that allows for quick & easy suspension geometry settings.

Using eccentric suspension bushings inserted into the aluminum holders – as well as additional suspension shims – the XB8 suspension geometry can be easily adjusted to adapt to any condition.

Machined from premium Swiss 7075 T6 aluminum and black coated.

Alu Wheel Hubs

To improve the out-of-the-box geometry, the XB8 now includes both front & rear wheel hubs with a +1mm off-set which is the most favorite choice for most of the track conditions.

Ultra-lightweight 17mm wheel hex drive hubs are CNC-machined from Swiss 7075 T6 black-coated aluminum.

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

Central Drive Shaft

All XB8 drive shafts are manufactured from world-renowned HUDY Spring Steel™, resulting in some of the thinnest and most durable drive shafts found in any RC vehicle.
All XRAY drive shafts and outdrives are hardened with a proprietary hardening process to provide unsurpassed lifespan & reliability.

Redesigned Bulkhead

Reinforced front and rear bulkheads were updated for added strength to ensure higher reliability and to improve the seal between the main bulkhead and cover plate. The revised bearing inserts also feature improved dust resistance and prevent debris from entering the bulkhead assemblies while offering the valuable differential height adjustment.

Diff Height Adjustment

The diff height adjustment of the semi-split bulkheads uses eccentric bushings to set the diff position. The diff height has 3 different settings. The diff height adjustment is a vital tuning option that allows quick set-up adaption for all different track conditions.

The ideal position will vary depending on the track conditions and ride height.

Central Drive Train

The design of the semi-split bulkhead allows to adjust the angle of the CV joint depending on the track conditions, traction of the track and ride height used.

At the high traction tracks a lower ride height is used and thus the diff placed in upper position to keep the drive shafts straighten and corresponding CV joint also in upper position.

At the low traction tracks an increased ride height is used and thus the diff placed in lower position to keep the drive shafts straighten and corresponding CV joint also in lower position.

Matched Gears

The differential crown gear and bevel drive gear feature specially designed profiles of the 46T and 13T gears for a perfectly matched engagement for smoother operation, less drag and significantly longer lifespan.

Gear Differential

The high-volume differentials improve vehicle control and consistency over long runs and enhance reliability. The differentials feature larger capacity cases and larger internal gears with more teeth for improved differential moment. The larger oil volume and the shape of the gear teeth reduce overheating for improved consistency. The stronger diff pin design also improves reliability.

Easy Diff Access

The semi-split bulkhead design and compact front bumper allows direct access to the differential while the entire suspension assembly remains mounted on the car.

Steering System

The steering system includes an Ackermann plate and graphite servo saver component shape to work with the semi-split bulkhead.

To ensure servo saver reliability, the servo saver parts are moulded from graphite material which is more resistant and efficient in dusty conditions. The dual-arm steering system is simple yet effective, featuring an integrated and easily adjustable servo saver, and a Swiss 7075 T6 aluminum steering plate.

The conical spring is longer and stronger, ensuring more precise steering and improved reliability.

Ackermann is easily adjusted by changing steering link mounting positions on the steering plate. Bump steer is adjusted by inserting shims between the steering plate and steering linkage.

Front Upper Arms

Front upper arms have additional mounting holes for the optional front upper arm wings. The wings increase downforce on the front suspension for increased traction and helps to keep the buggy nose down.

Optional wings are available in Lexan and Carbon alternatives.

Suspension Arms

To ensure the performance and reliability, the Pivot Ball suspension arms and optional C-hub suspension are molded from special composite mixture. The rear suspension arms are molded from extra-hard composite mixture that makes the car easier to drive. The front lower and upper arms feature a composite mixture change from soft to medium. The optional front lower C-hub suspension arm is molded from a hard composite mixture.

Diff Gears & Drivetrain Ratio

Specifically chosen gear ratio provides sufficient adjustments range. Differential main gears are manufactured from HUDY Gear Steel on a precision manual gear machine. This material was specially formulated and developed for use in gears. All gears are hardened to provide the longest possible lifespan.

A wide range of different gears — spur gear, clutchbell, crown gear — is available for perfect set-up and tailoring to particular racing conditions.

• Clutchbells are available in sizes of 13T and 14T.

• Spur gears are available in a range of 46T, 47T, and 48T.

Brake System

Specially designed centering brake screws’ smooth surface improve braking feel and provide more consistent operation as the brake pads slide more easily on pin.

The spring and ball-shaped bushing give more reliable and consistent brake linkage operation.

To further improve the braking efficiency and to ensure consistent braking characteristics, the ultra-efficient pre-glued brake pads are included in each XB8 kit.

The laser-cut, precision flat-ground steel brake disks provide fade-free braking in conjunction with the pre-glued brake pads. The brake disk is small, slim, and very lightweight. The precision hand-grinding allows true, wobble-free rotation. Both brake disk and brake pads are specially heat-treated for maximum lifespan.

Chassis Braces

The mounting of the chassis brace to the bulkhead eliminates transfer of energy from the suspension via shock towers to ensure more precise landings and more off-power traction.

The included rear brace is moulded from a medium-stiff composite mixture for improved flex & rigidity, and allows the mounting of optional graphite inserts to reinforce the chassis brace to make it even stiffer for particular track conditions.

Side Guards

Side guards feature a larger bottom radius to give better stability on rough tracks. The radius of the side guards increases the car’s longitudinal flex. The side guards are moulded from a special composite mixture for increased flex that helps generate more traction.

The tough composite side guards protect the car, muffler, and fuel tank from side impacts. The side guards perfectly fit the chassis and seal against dirt.

Optional side guard braces allow for very efficient and easy chassis flex adjustment to adjust the handling of the car to different track conditions. By adding the graphite braces, the entire chassis is reinforced and stiffer flex will improve handling in high-traction conditions. 

Chassis Chamfered Edges

The chassis features chamfered front edges which prevents dirt pick-up when the chassis contacts the track. The chamfered edges will not “cut” the dirt, but rather the dirt will slide along the chamfered edges and not get stuck at the front of the chassis.

The side guards were moved 4mm rearwards to ensure that under full throttle and full steering lock the inflated tires will not contact the side guards and can operate freely.

Drivetrain

The XB8 is a conventional shaft-driven 4WD off-road car featuring:

• Front & rear gear differentials with adjustable oil viscosity, featuring 46T crown gears and 13T pinion gears

• Central differential with adjustable oil viscosity, featuring 48T spur gear with standard 14T engine clutchbell

• Front & rear universal drive shafts, and central CVD drive shafts

Rear Uprights

Harder rear uprights maintain stability in all track conditions. The hard material also improves the handling in hotter conditions and better maintains it shape for improved bump absorbing. The uprights are super-strong and feature a larger outside 8x16x5mm ball-bearing for increased reliability and lifespan.

Brakes Linkage

Brake linkage assemblies with stiff springs and ball-shaped bushings result in a more reliable and consistent brake operation through even the longest runs.

Wickerbill Wing

Wickerbill rear wing features more downforce that helps increase traction when needed, and has 12 pre-marked air flow hole positions that can be opened to fine tune downforce for any conditions. The wickerbill plate is mounted via 5 screws for easy downforce setup.

Made from a strong special composite mixture, the wing was designed to survive severe abusive and extreme crashes while keeping its shape. 

The optional Lexan wing has an adjustable position and consists of two pieces: the main wing and the center fin that adds more stability and increases strength of the wing around the mounting area. The rear section of the wing is pre-bent to reinforce the wing and eliminates the use of additional heavy composite wickers. This makes the back of the wing strong while still allowing for wing flex in a crash. The pre-bent rear section of the wing is an important detail to create the desired downforce. Used by the factory team and suggested for all track conditions.

• Wickerbill plate to increase downforce
• 12 pre-marked holes to fine tune downforce
• Wing Side Shape – zostava
• Frontwards Wing position – zostava a vyhodit NEW

Wing Holder

The rear wing holder has a super-slim, 1-piece design that has reduced weight and increased strength. The wing holder fits the semi-split bulkhead and provides maximum stability while still allowing flex during impacts.

Shorter Wing Holder

The wing mount allows installing the wing further forward to create more downforce on the rear wheels to increase rear traction. The wing holder allows the wing to be positioned 11mm further forwards comparing to previous versions.

The super-slim, 1-piece design of the holder has low weight without sacrificing strength. Made from a special composite mixture to withstand abuse and crashes.
The wing holder shape gives maximum stability while still allowing flex during impacts.

XB8 “Eazy” Body

The “Eazy” Body was created after significant time spent testing dozens of different alternatives until the final design was selected. The design of the body improves the handling for all skill levels, from local racers to World Champions. The “Eazy” Body makes the XB8 more stable at speed and more reactive in the corners.

The redesigned sides of the body improve stability at higher speeds. The round front cab and profile make the XB8 easier to drive. Some of the redesigned down force areas increase the speed of the car. The central fin on the roof help control the car more precisely making handling more predictable. Overall, the “Eazy” body is the most significantly improved performance off-road body we have designed.

The front cabin was redesigned with a wider and cab forward design so both left and right sides generate matching downforce even with the cut-out opening for fuel tank.

The body is fully compatible with the XB8 and XB8E platforms.

Turnbuckles

To guarantee maximum reliability, all turnbuckles are manufactured from a special blend of HUDY Spring Steel™ which is specifically formulated for turnbuckles. The turnbuckles have a tougher core, making them very well suited for the steering system and rear upright linkages. 

Pivot Balls

To increase the reliability and free movement of suspension even in the extremely dusty conditions, the pivot ball cups are moulded from a special graphite material that ensures more free movement even when dust builds up.

To reduce weight and lower the CG, the front upper pivot balls are combined with a steel threaded part for maximum strength. The aluminum ball is machined from premium Swiss 7075 T6 and additionally hard coated for extended lifespan.

Central Diff Gear

The central differential is an extra-large size for increased reliability and performance. The differential is over 5mm larger, with an increased oil capacity to reduce oil overheating in long runs, helping to keep differential performance as consistent as possible. 

Internal Diff Gears

The 20T and 10T internal diff gears are larger to ensure reliability and reduce diff oil overheating. The greater number of teeth ensures more precise fitment and engagement.

Pressed-steel differential bevel and satellite gears are heat-treated and machined for superior precision and smooth operation. 

Diff Outdrives

Updated diff outdrives accommodate the stronger diff pins. 

To reduce rotating weight, the super-lightweight diff outdrives are machined from HUDY Spring Steel™ which allows unnecessary material to be removed to further reduce weight without affecting durability. The inner portions of the outdrives are additionally hand-ground for maximum precision and fitment into the diff case.

All outdrives are hardened using HUDY’s own special hardening process for extended lifespan and reliability.

Gear Differentials

Both front and rear differentials are identical for easier maintenance and servicing.

The Large Volume diffs feature higher capacity cases, stronger diff pins, and large internal gears with more teeth for improved differential action, consistency and overall reliability. The larger volume of the differential and the shape of the gear teeth help reduce oil overheating.

Center Differential Access

Access to the center differential is super easy by releasing the upper deck with only 4 screws. The low center diff housing is sized to accommodate optional spur gears, and the stands are lowered to keep the weight as low as possible and to allow smaller central diff gears to be used. The center diff housing stands hold the effective and race-proven brake system.

Wing Holder Brace

To help prevent rear gear box breakage during crash impacts, the rear wing construction features wing holder brace that transfers crash impact energy from the wing and shock tower to the chassis where it is centrally resolved.

The wing holder brace includes an integrated body post as well.

Fuel Tank

The XB8 fuel tank complies with the latest rules featuring the transient jet that ensures the internal volume of the fuel tank cannot be changed by pulling the fuel line.

The extra-strong fuel tank features an integrated floating stone filter that ensures that the fuel pickup will always be in the correct orientation, even if your car isn’t. This fuel pickup system will allow fuel to continue to flow to your engine, even while waiting for a marshal to reach your inverted car and put it back on its wheels.

Internal baffles inside the fuel tank ensure that the fuel will always be in the area around the fuel line intake so even during large jumps the fuel will be constantly supplied to the engine.

The fuel tank cap features a very strong spring which ensures the cap will always close after refueling, and the specially designed rubber gasket perfectly seals the fuel tank and ensures no fuel will leak outside.

Engine Mounts

The engine mounts extend up to the engine front bearing for improved chassis reinforcement in the longitudinal direction, and in jumps this will minimize chassis bending between the clutchbell and spur gear.

The CNC-machined aluminum engine mounts are made from superior-grade, lightweight alloy which helps to dissipate engine heat. The engine mounts are easily adjustable to obtain proper gear mesh.

High-Torque Clutch

The high-torque clutch features a lightweight flywheel. The flywheel features reduced mass for quicker engine response and clutch engagement.

The high-torque clutch provides smooth, continuous power transfer from the engine to the driveline. With the included Hard springs, the clutch engages higher in the RPM range, resulting in more controllable power during acceleration while still maintaining good engine response and performance on jumps.

The Swiss 7075 T6 clutch shoes are small, lightweight, and designed for engagement during the entire travel of the shoe. The shoes are less sensitive to wear and results in improved lifespan.

The smaller diameter allows the flywheel to be more protected after landing large jumps, so there is a reduced chance of accidental engine stoppages.

The extra-tough flywheel nut is machined from Hudy Spring Steel™.

The clutch is equipped with hard clutch springs; optional soft and medium springs are also available.

4-Shoe Clutch

The optional 4-shoe clutch features smaller, lighter internal parts, and the design allows for more balanced clutch bell engagement compared to a traditional 3-shoe design.

The 4-shoe design allows the use of multiple combinations of different shoe hardness and spring tensions for clutch engagement tuning, and even allows for mixed combinations of shoes and springs which gives ultra-fine engagement choices. There are 4 different hardness of shoes and 3 different hardness of springs available. Changing the clutch configuration is very easy thanks to the special assembly screws that hold the shoe and spring.

SOFT clutch setting generates the highest amount of traction and engages earliest;

MEDIUM clutch setting allows more clutch slippage and engages later;

HARD clutch setting engages latest and provides more revs to engine.

Shock Pistons

Ultra-precise shock pistons feature 6-, 8- and 10-hole options. The big-bore pistons are molded from tough, well-proven Delrin® material to provide smooth action and durability. The precision molding production process ensures perfect piston roundness after production, so that the pistons move super-smoothly inside the shock bodies for identical perfect action in all four shocks.

Shock Springs

The XB8 includes the 4-dot front shock springs for stability. XRAY shock springs are manually measured, selected and matched into pairs to guarantee precisely equal length and damping characteristics.

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.

Socket Head Cup Screws

To increase lifespan and improve ease of servicing, socket-head cup screws are used instead of regular hex screws. The socket-head cup screws are stronger and more reliable, making it easier to work on the car.

Ball-Bearings

A full set of 24 high-speed ball-bearings are used throughout the XB8 drivetrain.

All-new grease lubricated bearings are included for the pinion gears and diffs to increase reliability and lifespan, especially in dusty conditions. The remaining bearings are degreased and oiled with AeroShell® Fluid 12 to reduce drag and maximize driveline efficiency.

Graphite Grease

The XB8 includes premium HUDY Graphite Grease - a high-performance, advanced-technology semi-fluid lubricant which incorporates both extreme pressure additives and finely-dispersed graphite for load carrying. HUDY Graphite Grease is intended primarily for the lubrication of rotating parts and loaded gears. In addition to providing outstanding load carrying, it is formulated to have excellent adhesion and resistance from "flinging off" under extreme conditions. HUDY Graphite Grease reduces wear and increases parts life.

Click here for more information of the full HUDY Grease range

Air Filter

To minimize the dust getting into the air filter, the air filter cover mounting positions were modified and improved.

The smooth-flowing, efficient air filter is made from two parts. Air filter oil is included as standard. The universal rubber elbow allows fitment to most standard 1/8 buggy engines.

2-in-1

The XB8 design allows to accommodate either the C-hub or Pivot Ball suspension. The included Pivot Ball suspension can be easily exchanged for the optional C-hub suspension to accommodate to the particular track conditions.

C-hub Suspension

#350910 XB8/XB8E FRONT C-HUB SUSPENSION - SET

The optional C-hub is perfectly suited for smooth and short technical tracks & smooth surface conditions. At these track conditions the C-hub suspension generates increased frontward traction as well increased overall traction with enhanced steering.

The C-hub suspension includes lower suspension arm, steering block with Ackermann plate, C-hub, camber link & Ackermann steering plate.

Adjustment Possibilities

The XB8 features fully-adjustable front & rear suspension geometry. For quick & easy adjustment, we recommend using set-up tools and accessories from HUDY, the world leader of RC tools.

The extensive and impressive range of adjustment possibilities includes: Caster, Camber, Toe, Kick-up, Anti-dive, Anti-squat, Ride height, Downstops, Track-width, Lower roll center, Upper roll center, Bump steer, Wheelbase, Ackermann, Fully-adjustable shocks, Adjustable front and rear differentials, XRAY Multi-Flex™

Chassis Balance

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

• Brand: XRay
• Part No: XR350020
• Barcode: 8581703500209
• Scale: 1:8
• Vehicle Type: Buggy
• Power Source: Nitro
• Surface Type: Off Road
• Build Level: Unassembled (Kit)