Pro Scale® Performance
Pro Scale is a new Traxxas innovation that captures true-scale realism and combines it with extreme 6s LiPo power and 50+ mph performance. The Traxxas Unlimited Desert Racer faithfully captures the look and feel of Trophy Trucks and Unlimited Trick Trucks as they charge hard across the desert at full speed.
Driving Realism
The Traxxas UDR® is engineered on an authentic, true to scale 4-wheel drive desert race truck chassis. The 4-link solid rear axle design provides huge suspension travel with authentic driving dynamics. From the cantilever sway bars to the 8 GTR shocks, Traxxas has accurately reproduced a true unlimited desert race chassis in both form and function.
6s Extreme Power
The 50+ mph UDR delivers its pro-level performance with brutal 6s power. The VXL-6s ESC combines massive power handling with high-tech telemetry features. An ultra-tough drivetrain harnesses the extreme power to make it easy to control and fun to drive.
Model 85086-4 $749.95
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Innovation
Explore these key features to see how every design element on the Unlimited Desert Racer combines to create an authentic and thrilling driving experience.
High-Voltage LED Lights
Flood the desert with high-intensity light from the rugged waterproof LED lighting system. A high-voltage amplifier powers 204 individual LEDs for brilliant light while tightly regulating the voltage to eliminate flickering and dimming. The rear light bar features class lights and smart brake lights that work when brakes are applied in either direction. Learn more >
Solid Rear Axle
The unique solid rear axle design of the UDR® combines with the 4-link geometry to eliminate torque twist. It puts 6s power to the ground like nothing else, tracking arrow straight while accelerating and then rotating on demand for effortless on-throttle power slides. The authentic true-scale driving dynamics challenge your skill behind the wheel in fun and exciting new ways.
Pro Scale® Realism
Traxxas Pro Scale design merges scale realism with extreme 6s performance, durability, and speed. From shock reservoirs, fire extinguishers, and fans to the functional spare tires and spare driveshaft, Traxxas elevates scale realism to a new level. At the same time, it’s been engineered for hard-charging 50+ mph desert racing action.
Secure Battery Compartment
A heavy-duty battery latch locks into place to secure batteries inside the compartment. An outer skid plate keeps debris out of the battery compartment and adds a second layer of security to help protect the batteries.
Rugged Tube Cage
The beautifully sculpted tube framework integrates fully with the chassis and suspension to form an incredibly strong, lightweight structure for the shocks and suspension components to mount. The realistic design even includes the “tin” panels so the race chassis looks just as good with the body off for pre-race practice runs.
Easy Access Design
The unique inverted tub chassis helps maintain authentic true-scale design while still allowing easy access to critical components underneath the truck.
Traxxas Stability Management®
Traxxas Stability Management (TSM)® keeps the front end locked on course, allowing the driver to accelerate hard and straight and even slide out the rear with confidence. TSM never kills the fun by cutting throttle or slowing down the truck. Adjust the amount of assistance from off to 100% right from your transmitter. Learn More
Twin GTR Shocks
Twin GTR shocks at each corner replicate full-scale desert truck performance in perfect scale detail while delivering a plush ride through deep whoops and the roughest sections of the course.
Pro Scale® Size
Only slightly shorter than the X-Maxx®, the Unlimited Desert Racer’s large footprint is right-sized to offer increased capability and 6s power-handling off-road, while still being easy and convenient to handle and transport.
Extreme Suspension Travel
The key to the Unlimited Desert Racer’s phenomenal off-road ability lies in its extreme suspension travel and ground clearance. The plush, seemingly bottomless travel is built to soak up whoops and washboard ruts with ease. The suspension does the work while the chassis remains steady and composed.
4-Link Rear Suspension
Massive trailing arms and heavy-duty linkages, along with the functional limiting straps, keep the solid axle firmly in control. The precision-engineered 4-link geometry rewards driver finesse with responsive and predictable handling as you rotate the truck and steer with the throttle through the tight sections of the course.
Heavy-Duty Steel Drivetrain
The drive system uses thick steel axles and an all steel-gear drivetrain to drive all four wheels. Heavy-duty center driveshafts transfer power to heavy-duty steel ring and pinion gears front and rear. 4-wheel drive delivers maximum acceleration off road.
Direct Drive Transmission
Large steel spur and pinion gears provide the ultimate in toughness and durability. The Torque-Biasing Center Drive distributes power between the front and rear drives for maximum traction on any surface. There’s no clutch to slip, just instant power on tap when you need it. The entire transmission and motor remove as a single unit for easy maintenance.
Details
Beneath the Unlimited Desert Racer’s tough exterior and beautifully sculpted, fully-integrated tube frame chassis are the keys to its thrilling performance. Peer beneath the skin to discover what lies at the heart of this revolutionary new off-road vehicle.
- Scale Realism
- Chassis
- Driveline
- Suspension
- Electronics
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Pro Scale® Body
Precision-modeled after a full-scale unlimited desert race truck, the rugged Pro Scale body is securely mounted to the frame. The open window design showcases the intricate tube frame chassis and detailed interior co*ckpit. Choose either the Fox® or RIGID® body style to light up the desert with vibrant color!
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BFGoodrich® Tires and Wheels
Aggressive replica BFGoodrich® KR3 tires ride on tough 17 mm hex Desert Race wheels (Fox®) or licensed Method® Race wheels (RIGID®) with bright beadlock rings. The tires are scale replicas of the 40″ tires used on the top trucks in the desert.
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Rugged Tube Cage
The rugged tube frame chassis is fully-functional and an integral part of the overall unlimited desert race chassis design. The tube frame chassis provides rigid support for shocks, bumpers, and suspension. The design is engineered to help absorb and distribute impacts for the rock-solid durability that is required in the desert.
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Realistic Side Plates
Realistic chassis side plates (tin work) mount directly to the roll cage for true Pro Scale® realism. Functionally, they add structural rigidity and help keep debris out of the co*ckpit. Remove the body and the desert race chassis looks even more amazing and realistic.
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Detailed Interior
The highly detailed interior with driver figures enhances the realism to the point that you might think you are looking at a real truck while driving. Switches, radios, safety gear, shifter, navigation…it’s all there!
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Molded Body Details
From bumper to bumper, beautiful precision-molded details continue the Pro Scale® theme. The replica brake calipers and discs, floor jack with handle, batteries, fans, oil cans, fire extinguishers, and shock reservoirs provide the perfect scale touches.
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Functional Spares
Like a true desert race truck chassis, two spare wheels and tires are mounted on the rear frame. Identical to the other four, each is fully functional and ready to mount. The spare driveshaft mounted to the frame is not just for looks. It is a functional spare for installation on the truck if needed.
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Inverted Tub Chassis
The inverted tub chassis makes service and maintenance easy. Replace batteries without removing the body or drop the entire motor and transmission assembly as a single unit. This innovative design also concentrates weight as low as possible to lower the overall center of gravity (CG) of the truck for superior handling and performance.
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Protective Skid Plates
Integral to the inverted tub chassis, tough skid plates keep out debris and protect vital vehicle components. The two-piece design includes a separate door for the battery compartment that snaps in and out of position in just seconds.
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Versatile Battery Compartment
The versatile battery compartment accommodates single 4s LiPo packs or dual 2s or 3s LiPo packs. A rugged battery strap locks into place to hold even the largest batteries securely. The strap attaches firmly to the frame so there are no clips to lose. View the full list of compatible batteries here.
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Fixed Battery Connectors
Fixed battery connectors make battery installation a breeze. The innovative design allows a range of single and dual-battery configurations to be used.
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Fixed One-Piece Body
The one-piece body attaches securely to the functional tube frame chassis in multiple locations for long-lasting durability and scale realism. With no body clips to pop off, this armor-tough body allows easy access to the electronic speed control and showcases the highly detailed suspension, co*ckpit, and tube frame chassis.
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Reinforced Bumpers
Impact absorbing front and rear bumpers soak up the hits to protect the chassis and provide rigid support for the fixed body.
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Fixed Gear Mesh
Proper gear mesh is critical with high-torque 6s power systems. A thick aluminum motor plate with reliable fixed-pin gear mesh settings are used for perfect alignment.
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Dual Bellcrank Steering
Built for the rigors of desert racing, fixed-length steering links are mounted to dual bellcranks with an integrated servo saver for precise, reliable steering.
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Solid Rear Axle
UDR® rides on a solid rear axle with a spool for supreme toughness and authentic driving dynamics. Large diameter steel half shafts provide extra durability out to the wheels.
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Heavy-Duty Front CV driveshafts
Heavy-duty steel CV driveshafts with steel 6 mm stub axles drive the front wheels from the front differential.
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Pro Scale® Driveshafts
A heavy-duty, splined driveshaft channels power to the front differential while rear power is transferred via a fixed-length aluminum and steel driveshaft. The realistic fixed-length driveshaft provides superior strength, reduces driveline lash, and lowers rotational mass for improved response.
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Torque-Biasing Center Drive
The Torque-Biasing Center Drive distributes power between the front and rear axles for maximum traction on any surface. There’s no clutch to slip, just instant power on tap when you need it.
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Steel Ring and Pinion Gears
Steel ring and pinion gears provide extreme durability for hard-charging racing action.
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New Extreme-Travel GTR Shocks
Huge, Extreme-travel aluminum GTR shocks are threaded to adjust ride height on a single high performance spring at each corner. A separate slave shock provides additional damping action and doubles the oil capacity for the smoothest action possible.
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Heavy-Duty Front Suspension
Massive front suspension arms form a double wishbone design to maintain proper geometry throughout their huge range of travel. The semi-solid design fully captures both shock and sway bar rod ends for ultimate durability and toughness. Large steering blocks use oversized bearings to accommodate the steel axles.
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Extreme Suspension Travel
The key to the desert race chassis’ phenomenal off-road capability lies in its massive suspension travel. With 3.15″ of travel in the front and 4″ in the rear, the suspension soaks up whoops and washboard ruts with ease.
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Realistic Sway Bars
The cantilever sway bars are actuated by pushrods for precise control and realistic performance and tuning.
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Suspension Limiter Straps
Expertly detailed and fully functional, the suspension limiter straps keep the solid rear axle under control and prevent overextension.
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LED Lighting Technology
The innovative high-voltage amplifier delivers clean, stable power to all 204 individual LEDs to minimize losses from excessive current and heat and prevent the flickering and dimming associated with generic light kits. The powerful Traxxas Link App further customizes the lighting modes to your specifications or turn the lights on and off directly in the app.
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New VXL-6s™ ESC with Telemetry
Fortified to handle extreme 6s LiPo power, the VXL-6s speed control flows current to the motor through Maxx Cable wiring with large 6 mm connectors. LED status lights keep you fully informed on the ESC’s status and a heavy-duty fan keeps temperatures under control. The high-tech VXL-6s speed control provides real-time telemetry using the Traxxas Link app while retaining Traxxas’ easy one-button programming simplicity.
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2200 kV Brushless Motor
The 2200 kV brushless motor transforms 22+ volts of LiPo power into 50+ mph speed and desert shredding torque for the ultimate in Pro Scale® performance.
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Waterproof Metal Gear Servo
The digital 2075R metal-gear servo provides precise input and powerful torque. It’s fully waterproof to make all-weather adventures a reality and it’s further protected from damage underneath the tough skid plates.
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TQi™ Radio System
The fully featured Traxxas TQi™ 2.4 GHz radio system delivers the superior speed, precision, and control required for the Desert Racer’s immersive driving experience. The transmitter is Traxxas Link enabled, making it easy to pair a smartphone with the optional 6511 Wireless Module (sold separately). The Traxxas Link app opens up a whole world of tuning options and also displays real-time telemetry from the ESC.
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Waterproof from the Start
Patented Traxxas innovation seals out the water so that the fun doesn’t end in water, snow, and mud. Dirty truck? Just hose it off. The ESC, servo, and receiver box are all fully waterproof.
Photo Gallery
- Action
- Studio
- Chassis
- Details
UDR (#85086-4) with LED Lights (Blue) - Action
UDR (#85086-4) with LED Lights (Blue) - Action
UDR (#85086-4) with LED Lights (Blue) - Action
UDR (#85086-4) with LED Lights (FOX) - Action
UDR (#85086-4) with LED Lights (FOX) - Action
UDR (#85086-4) with LED Lights (FOX) - Action
UDR (#85086-4) with LED Lights (FOX) - Action
UDR (#85086-4) with LED Lights (FOX / RIGID) - Action
UDR (#85086-4) with LED Lights (RIGID) - Action
UDR (#85086-4) with LED Lights (RIGID) - Action
UDR (#85086-4) with LED Lights (RIGID) - Action
UDR (#85086-4) with LED Lights (FOX) - Action (shown with Paddle Tires, sold separately)
UDR (#85086-4) with LED Lights (FOX) - Action (shown with Paddle Tires, sold separately)
UDR (#85086-4) with LED Lights (FOX) - Action (shown with Paddle Tires, sold separately)
UDR (#85086-4) with LED Lights (Blue) - Front Three-Quarter View
UDR (#85086-4) with LED Lights (Blue) - Front Three-Quarter View
UDR (#85086-4) with LED Lights (RIGID) - Front Three-Quarter View
UDR (#85086-4) with LED Lights (RIGID) - Front Three-Quarter View
UDR (#85086-4) with LED Lights (FOX) - Front Three-Quarter View
UDR (#85086-4) with LED Lights (FOX) - Front Three-Quarter View
UDR (#85086-4) with LED Lights (Blue) - Front View
UDR (#85086-4) with LED Lights (Blue) - Front View
UDR (#85086-4) with LED Lights (RIGID) - Front View
UDR (#85086-4) with LED Lights (RIGID) - Front View
UDR (#85086-4) with LED Lights (FOX) - Front View
UDR (#85086-4) with LED Lights (FOX) - Front View
UDR (#85086-4) with LED Lights (Blue) - Rear Three-Quarter View
UDR (#85086-4) with LED Lights (Blue) - Rear Three-Quarter View
UDR (#85086-4) with LED Lights (RIGID) - Rear Three-Quarter View
UDR (#85086-4) with LED Lights (RIGID) - Rear Three-Quarter View
UDR (#85086-4) with LED Lights (FOX) - Rear Three-Quarter View
UDR (#85086-4) with LED Lights (FOX) - Rear Three-Quarter View
UDR (#85086-4) with LED Lights (Blue) - Side View
UDR (#85086-4) with LED Lights (Blue) - Side View
UDR (#85086-4) with LED Lights (RIGID) - Front Three-Quarter View
UDR Orange
UDR Red
UDR Red
Chassis Bottom
Chassis Bottom
Chassis Side Orange
Chassis Side Red
Chassis
Chassis
Chassis
Chassis
Chassis
One-Piece Body
Bumpers on the front of the truck
Bumpers on the rear of the truck
Pro Scale® Details on the Rear
Pro Scale® LED Lights on the Rear
Pro Scale®
Replica Tires
Replica Tires
4-Link Suspension
Sway Bars
Suspension Limiter Straps
Front Suspension Droop
Front Suspension Carrier
GTR Shocks
Comparison between the new Long-Travel GTR Shocks and the old GTR shocks
Solid Rear Axle
CV Driveshafts Front
Center Driveshaft
Dual Bellcrank Steering
Metal Gear Servo
Motor Mounting Plate
Direct Drive Transmission
Differential (Center)
Differential (Front)
VXL Power System
Waterproof Receiver Box
Stay Updated
Unlimited Desert Racer Data
- Truck Specs
- Motor Specs
- ESC Specs
- Features List
- What’s Included
| Length: | 27.32 inches (694 mm) |
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| Front Track: | 13.57 inches (345 mm) |
| Rear Track: | 13.57 inches (345 mm) |
| Ground Clearance: | 2.27 inches (58 mm) |
| Weight: | 13.4 pounds (6.1 kg) |
| Height: | 10.29 inches (261 mm) |
| Wheelbase: | 16.53 inches (420 mm) |
| Front Shock Length: | 5.28 inches (134 mm) |
| Front Threaded Shock Length: | 5.28 inches (134 mm) |
| Rear Shock Length: | 6.3 inches (160 mm) |
| Rear Threaded Shock Length: | 5.55 inches (139 mm) |
| Tires (pre-glued): | 134 mm x 57 mm BFGoodrich® KR3 replicas |
| Wheels: | dual diameter 40 mm x 56/81 mm |
| Speed Control: | Velineon® VXL-6s |
| Motor (electric): | 2200 kV |
| Transmission: | Direct-drive with Torque-Biasing Center Drive |
| Overall Drive Ratio: | 17.89:1 |
| Front Differential Type: | Sealed, 4-gear |
| Rear Differential Type: | Locked spool |
| Center Differential Type: | Sealed, 4-gear (1M weight oil) |
| Chassis Structure / Material: | Inverted composite tub |
| Brake Type: | Electronic |
| Drive System: | Shaft driven 4WD |
| Steering: | Dual bellcranks with ball bearings |
| Radio System: | TQi™ 2-channel transmitter with 6533 TSM receiver |
| Servo: | 2075R Metal Gear |
| Top Speed (stock gearing): | 4s LiPo – 30+ mph, 6s LiPo – 50+ mph |
| Skill Level: | 5 |
| Battery Compartment: | 181 mm x 46 mm x 56 mm |
| Transmission: | Direct-drive with Torque-Biasing Center Drive |
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| Overall Drive Ratio: | 17.89:1 |
| Front Differential Type: | Sealed, 4-gear |
| Rear Differential Type: | Locked spool |
| Center Differential Type: | Sealed, 4-gear (1M weight oil) |
| Chassis Structure / Material: | Inverted composite tub |
| Brake Type: | Electronic |
| Drive System: | Shaft driven 4WD |
| Steering: | Dual bellcranks with ball bearings |
| Radio System: | TQi™ 2-channel transmitter with 6533 TSM® receiver |
| Servo: | 2075R Metal Gear |
| Top Speed (stock gearing): | 4s LiPo – 30+ mph, 6s LiPo – 50+ mph |
| Skill Level: | 5 |
| Battery Compartment: | 181 mm x 46mm x 56 mm |
| Type: | Sensorless brushless |
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| Weight: | 14.32 ounces (406 g) |
| Length: | 2.97 inches (76 mm) |
| Diameter: | 1.65 inches (42 mm) |
| Connector Type: | Traxxas 6.5 mm bullet connectors |
| Input Voltage (cells): | 4s–6s LiPo (max: 25.2 volts) |
|---|---|
| Case Size: | 2.28″ (58 mm) x 2.83″ (72 mm) x 1.81″ (46 mm) |
| Weight: | 7.30 ounces (207 g) |
| BEC Voltage: | 6.0 volts |
| BEC Current Continuous: | 10 amps |
| BEC Current Peak: | 20 amps |
| Reverse Delay: | Yes, with lockout |
| Low Voltage Detection (LVD): | Yes, programmable |
| Ports: | RX Input, Auxiliary Fan, Accessory Port |
- High-Voltage LED Lights
- Dual straight LED bumper-mounted LED light bars (52 LEDs each)
- Curved roof light bar (52 LEDs)
- Multifunction red and amber brake light/class light bar
- High-voltage 8-channel power amplifier for intense, brilliant LED lighting
- Regulated output for stable lighting performance
- (no flickering or dimming as the battery voltage changes)
- VXL-6s™ Waterproof Electronic Speed Control
- 6s LiPo compatible
- Integrated cooling fan
- Real-time telemetry via Traxxas Link
- Machined heat sink
- 3-LED status indicators
- Powered accessory ports
- 10 gauge silicone wire
- Velineon® 2200 kV Brushless Motor
- 4-pole 2200 kV brushless motor
- 5 mm output shaft
- Finned can for better heat dissipation
- Up to 50+ mph with Two 3s LiPo Batteries
- Traxxas Stability Management (TSM)®
- Improves straight line acceleration and braking on low-traction surfaces
- Maintains steering composure to allow throttle-on powerslides
- Never dulls throttle or slows the truck
- Adjusts from off to 100% assistance from the transmitter
- Innovative Battery Compartment
- Accommodates single 4-cell LiPo or dual 2-cell or 3-cell LiPo batteries
- Opens from underneath without removing body
- Fixed oversized battery strap locks batteries securely into place
- Separate skid plate to protect batteries
- TQi™ 2.4 GHz High Output Radio System
- TQi 2-channel transmitter
- Automatically stores and loads settings for up to 30 Traxxas Link enabled models
- Programmable multi-function knob
- Adjustable steering and throttle percentage (dual rates)
- Adjustable steering and throttle sensitivity (exponential)
- Adjustable steering and throttle end points
- 5-channel micro receiver (6533) with fail-safe security
- Patented waterproof receiver box with easy-access plug
- Large Pro Scale® Body with Highly Detailed Replica Parts
- Heavy-duty truck body mounts to chassis in multiple locations
- Strong and functional tube frame mimics full-size off-road racers
- Detailed interior cabin with driver figures
- Replica brake calipers and discs with integrated 17 mm wheel hubs
- Two fully-functional spare tires and functional spare driveshaft
- Highly detailed replica parts: fire extinguishers, shock reservoirs, jack, and tools
- Realistic side plates mount to tube frame
- Chassis
- Composite inverted tub design
- Makes maintenance easier
- Lowers center of gravity (CG) for improved handling
- Allows easy access to components
- Tough skid plates protect critical components
- Fully integrated tube frame for scale appearance and added rigidity
- Reinforced bumpers to absorb impacts
- ESC battery plugs hard mounted to chassis
- Composite inverted tub design
- Suspension
- Provides scale looks and authentic off-road driving dynamics
- Tough independent double-wishbone front suspension with captured rod ends
- Triangulated 4-link rear suspension with solid rear axle (patent pending)
- Tough composite trailing arms
- Steel upper links with 3 optional positions for suspension tuning
- Eight long-travel aluminum GTR shocks; four with springs and adjustable ride height collars
- Realistic and functional front and rear sway bars
- Detailed functional limit straps on rear axle
- Steering
- Chassis mounted 2075R metal-gear servo
- Dual bellcrank design with bearings and integrated servo saver
- Solid non-adjustable steering links for rugged durability
- Drivetrain
- Steel CV driveshafts (front) with 6 mm stub axles
- Steel straight axle (rear)
- Oil-filled limited slip front differential
- Locked steel spool (rear)
- Heavy-duty splined front driveshaft
- Fixed-length steel rear driveshaft
- Transmission
- All-steel gear direct drive transmission
- Torque-Biasing Center Drive™
- Removes as a single piece for easy maintenance
- Fixed-pin gear mesh system
- Wheels and Tires
- Replica BFGoodrich® KR3 off-road tires
- Beadlock-style 17 mm dual-diameter wheels
- Sealed Ball Bearings
- Hex Hardware with Rust-Resistant Black Oxide Coating
MODEL 85086-4: Unlimited Desert Racer Pro Scale® 4WD race truck, Ready-To-Race® with TSM®, with TQi™ 2.4 GHz radio system, VXL-6s brushless power system, and licensed race replica painted body
What’s In The Box:
- Unlimited Desert Racer with VXL-6s ESC and 2200 kV motor
- Quick Start Guide
- TQi™ 2.4 GHz radio system
- High quality maintenance tools
What You’ll Need:
- Batteries
Unlimited Desert Racer accepts a single 4s LiPo battery or dual 2s LiPo batteries or dual 3s LiPo batteries
- Charger
Traxxas EZ-Peak® Live charger (2971) is recommended for easy and fast charging performance
- AA Alkaline Batteries
Four AA alkaline batteries for the transmitter
