Xray XB4 2016 spec

Ausrab Industries

2016 All-new Specs

  • All-new chassis
  • All-new front & rear bulkheads
  • All-new side guards
  • All-new battery strap
  • All-new upper plates
  • All-new chassis braces
  • All-new motor mount
  • All-new 3-pad slipper clutch
  • All-new central drive shafts
  • All-new front & rear lower...
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2016 All-new Specs

  • All-new chassis
  • All-new front & rear bulkheads
  • All-new side guards
  • All-new battery strap
  • All-new upper plates
  • All-new chassis braces
  • All-new motor mount
  • All-new 3-pad slipper clutch
  • All-new central drive shafts
  • All-new front & rear lower arms
  • All-new rear uprights
  • All-new front & rear shock towers
  • All-new electronic plate
  • All-new front body post
  • All-new body
  • All-new weight balance
  • Improved handling


  • Designed for highest performance at all levels of racing
  • Engineered with attention to smallest details
  • Manufactured with legendary artistic craftsmanship from premium European materials
  • EFRA, ROAR, FEMCA spec compliant for stock and modified racing
  • Super easy to build, set up, maintain, and drive
  • Developed, designed and styled by Dipl. Eng. Juraj Hudy, manufactured exclusively by XRAY in Europe in the world's most sophisticated RC manufacturing facility
  • Revolutionary off-road platform with new benchmark for premium quality, reliability and performance
  • Premium XRAY service & support


  • Smarter chassis weight balancing options allow the motor mount and center diff assembly to move frontwards or backwards
  • Unique XRAY Multi-Flex™ technology for easy chassis flex adjustment
  • Swiss 7075 T6 hardcoated 2.0mm aluminum chassis with countersunk holes for flush, smooth underside
  • Tough composite side guards perfectly fit the chassis to seal against dirt and protect from side impacts
  • Compact electronics plate allows for mounting the speed controller for quick & easy removal and assembly
  • Graphite front, central & rear upper decks independent from chassis flex adjustment and work only as part of the front, central, and rear diff assemblies
  • Composite chassis braces for fine-tuning of the chassis flex
  • Two different battery straps short -or- long included. The long battery strap allows battery pack to be installed either frontwards or rearwards
  • Battery foam back spacer ensures the battery pack will not fall out
  • Thick 3.5mm graphite front shock tower & 3.0mm rear shock tower with multiple shock mounting and roll center positions
  • Extra robust front & rear bulkheads allow access to the differentials using only 4 screws

Differentials & Drivetrain:

  • Front & rear gear differentials with adjustable oil viscosity, featuring 35T crown steel gears and 14T steel pinion gears
  • Molded front & rear gear differentials for super-smooth, maintenance-free operation, features long-lifespan HUDY Spring Steel™ outdrives
  • Innovative aluminum motor mount allows frontwards or rearwards motor position for weight balance adjustment
  • Motor eccentric mounting plate inserts into an integrated motor holder/drivetrain support, allowing quick & easy motor rotation for gear mesh and secure clamping with a single screw
  • Robust central slip-adjustable clutch with 81T main spur gear molded from exclusive secret blend of composite material
  • Internal 1:2.5 drive ratio
  • 3-pad slipper clutch with ultra-efficient SLS material for more efficient & precise slip adjustment, and HUDY Spring Steel™ hardened outdrives for extra lifespan and reliability
  • Constant velocity drives (CVD) are manufactured from special HUDY Spring Steel for reduced weight and increased durability. The shafts are hand ground for maximum precision
  • Safety collars for all CVD drive shafts to keep mounting pins securely in place
  • Ultra-lightweight 14mm wheel hex drive hubs CNC-machined from Swiss 7075 T6 and additionally black-coated have ultra-true hex clamping design which ensures solid mounting of the wheel
  • Optional 14mm offset wheel hex drive hubs available for super-fine track-width adjustment: -0.75mm, +0.75mm and 12mm optional wheel hex drive hubs: 0mm, -0.75mm, +0.75mm, +1.5mm, +2.25mm
  • Full set of 22 high-speed, blue-sealed ball-bearings used throughout the drivetrain to ensure maximum efficiency, degreased and oiled with Aero Shell® Fluid 12 for maximum smoothness and long life


  • Swiss 7075 T6 aluminum suspension holders front and rear
  • Integrated Suspension Settings (I.S.S.) for quick & easy suspension geometry setting using eccentric bushings inserted into aluminum suspension holders
  • Specially-designed suspension components manufactured from carefully formulated custom composite mixtures to ensure proper flex and durability
  • Race-perfected suspension geometry for superior performance and versatility in all racing conditions.
  • Lightweight 1-piece caster blocks with preset 9° caster with easy adjustable roll center position featuring larger openings for quick and easy disassembly of CVDs; optional 6° & 12° caster blocks available
  • Front chassis feature pre-angled caster of 8° and with the variable I.S.S. settings a range 16~20° of total caster can be achieved
  • Tiny yet robust steering blocks molded from a special composite mixture for maximum strength featuring adjustable lower roll center.
  • Very compact 0° toe-in rear uprights feature 3 different upper roll center positions, staggered inner/outer bearing sizes for improved load support and unsprung weight, and wheelbase adjustability via included shims
  • Oversized outer bearings in uprights to for increased dynamic loads
  • HUDY Spring Steel™ material for turnbuckles (featuring a tougher core) is used for front & rear upright linkages, steering system, and servo saver
  • Anti-roll bars manufactured from special spring steel material to stabilize the car at both front and rear are mounted to the diff cases & can be easily adjusted via linkages; laser-engraved markings for easy identification, available in different sizes for fine-tuning


  • Simple, effective dual-arm steering system with integrated adjustable servo saver ensures perfect steering and easy Ackermann and bump steer adjustment


  • Consistent, reliable membrane-free big-bore shocks with bleed-screw shock cap design feature up-stop shock rod travel adjustment (via O-rings) and downstop adjustment (via shims under pistons)
  • Swiss 7075 T6 aluminum shock bodies, lower nut & bleeder shock caps are hard coated
  • Super-precise molded Delrin™ pistons are offered with different holes & diameters for precise shock adjustment; for custom adjustment, a set of blank pistons (no holes) are also included
  • Shock rods are machined from a special steel material, precision hand-ground for maximum smooth operation and additionally hardened for increased lifetime
  • Premium shock springs designed specifically for big-bore shocks; manually measured, selected and matched into pairs to guarantee equal length and damping characteristics; laser engraved for easy identification
  • Full line of linear -or- progressive shock springs available
  • Premium silicone oils laboratory tested and calibrated to ensure highest possible consistency and quality

Bumper, Body, Wheels:

  • Strong composite rear wing holder
  • Front lower bumper protrudes from the bottom of the chassis to absorb all impacts from contact between the chassis and the track surface
  • Beefy 6mm thick body posts from special composite material for maximum strength
  • High-downforce XB4 body is high-performance, low-profile, and aerodynamic to perfectly fit the XB4 layout, with front window and top roof flow channels for proper air flow, and side downforce areas and top central rib for higher stability
  • Specially designed 14mm hex hub wheels for high-competition racing; featuring reinforcement ribs to eliminate deformation and molded from very flexible material to retain shape even after impacts

Assembly, Set-up & Support:

  • Premium 3D full-color Instruction Manual & supplementary sheets
  • To fully understand the set-up possibilities we recommend the legendary HUDY Set-up Book which is loaded with over 40 pages of high-quality pictures and easy-to-read RC car set-up explanations
  • Exclusive Virtual Online Setup Sheet database with thousands of set-up sheets for race tracks around the world
  • Premium, unmatched XRAY online support

Adjustment Possibilities:

  • Fully-adjustable front and rear suspension geometry: caster, camber, toe, kick-up, anti-squat, ride height, downstops, track-width, roll center, wheelbase, roll centers, Multi-Flex™
  • Adjustable front & rear gear differential action (via oil viscosity)
  • Adjustable slipper clutch
  • Adjustable HUDY Sprint Steel™ turnbuckles (steering, front & rear upper links)
  • Multiple upper & lower shock mounting locations at front & rear
  • Adjustable Ackermann and bumpsteer
  • Adjustable front & rear anti-roll bars
  • Chassis pre-drilled holes for weight balance adjustment


Class: 1/10 electric 4WD off-road car
Width: Adjustable 245-250mm
Length: 350 mm
Wheelbase: Adjustable 279-281 mm
Weight: 850 g
Ready-to-run weight: 1650 g


Chassis: CNC-machined Swiss 7075 T6 aluminum 2.0mm
Front upper deck: Machined 2.0 mm laminated carbon graphite


Suspension: Adjustable suspension via Integrated Suspension System I.S.S.
Rear suspension: Lower arm with adjustable upper camber link
Front suspension: Lower arm with adjustable upper camber link and with 9° caster blocks
Rear upright: Composite 0° toe-in with dual arm mounting and 3 roll center positions
Shocks: Big bore membrane free shock absorbers with Delrin pistons
Shock towers: Machined 3.5 & 3.0 mm laminated carbon graphite (front & rear) with multiple shock mounting and camber link roll center positions


Type: Full-time shaft-drive 4WD
Primary: Pinion / spur
Drive shafts: HUDY Spring Steel™ CVD drive shafts
Central shafts: HUDY Spring Steel™ Direct Connection Shafts™
Differentials: Sealed gear differential, 6 gear, silicone-filled
Slipper clutch: Adjustable 3-Pad
Bearings: Rubber-sealed high-speed bearings


Primary ratio: 1:2.5
Differential pinion: 14T front / rear
Differential crown gear: 35T front / rear
Spur gear: 81T
Motor pinion: Not included


Camber: Adjustable front + rear
Front Caster: 9° static +7~11° caster in chassis = 16°~20° total caster range Optional 6° static +7~11° caster in chassis = 13°~17° total caster range Optional 12° static +7~11° caster in chassis = 19°~23° total caster range
Toe-in: Adjustable front + rear
Downstops: Adjustable front + rear
Front kick-up: Adjustable 7° ~ 11°
Rear anti-squat: Adjustable 1° ~ 5°
Anti-roll bars: 1.3mm front / 1.2mm rear
Ackermann: Adjustable
Bump steer: Adjustable
Steering: Centrally-positioned dual steering system

Body, Tires, Wheels & Misc

Body XRAY XB4 body wide V2
Tires: Not included
Wheels: XRAY Aerodisk 14mm Wheel hex hub

Adjustment Possibilities

Standard adjustment: Camber, toe-in, caster, track width, wheelbase, kick-up, anti-squat, roll center, Ackermann, bump steer
Instructions: Full-color manual with 3D graphics (40 pages)
Set-up book: Not included. HUDY 2-color off-road set-up book (40 pages) can be downloaded in the “Download section“ and it shows 1/8 off-road models in photographs contained within it. However, the methodology and set-up theory are the same for all modern 1/10 off-road cars.
Packaging: Carton box with vinyl bags with parts
Additionally included HUDY Graphite Grease, Silicone Oils, Authentication Certificate, Parts list & Exploded view, Decals

Items Not Included

Radio system (transmitter and receiver), steering servo, motor, pinion gear, LiPo battery packs, speed controller, charger, tires, inserts, double-sided tape, CA glue, bearing oil, medium-grade (blue) threadlock, universal tool for all nuts and turnbuckles and other tools

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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