UDI RC 1/12 SIERRA 4WD SHORT COURSE TRUCK B/LESS RTR - BLUE

The UDIRC UD1203 Sierra is a high-performance 1/12 scale four-wheel-drive brushless short course truck engineered for enthusiasts who demand durability, serviceability, and speed in a compact platform. Combining race-inspired styling with a fully sealed drivetrain, all-metal transmission components, and quick-access maintenance features, the UD1203 delivers an exceptional driving experience on dirt, gravel, pavement and mixed terrain.

At the heart of the Sierra is a powerful 2845-size 3800KV brushless motor paired with a programmable 45A brushless ESC capable of supporting both 2S and 3S LiPo batteries. This combination provides strong acceleration, impressive top-end speed and reliable power delivery while maintaining excellent efficiency and control.

The UD1203 is designed with long-term durability in mind. Its transmission utilizes steel universal driveshafts, a steel centre shaft, and metal differential and transmission gears to withstand high-power brushless performance. A fully enclosed gearbox helps protect critical drivetrain components from dirt, dust, sand and debris, extending component life while reducing maintenance requirements.

One of the Sierra's standout innovations is its quick-release service design. The drivetrain cover, centre driveshaft assembly, differential units and body shell can all be removed rapidly without extensive disassembly. This significantly reduces maintenance time and allows racers and hobbyists to perform upgrades, repairs and tuning adjustments in seconds rather than hours.

Handling performance is enhanced through adjustable aluminium oil-filled shocks, metal steering linkages, dual-ball steering knuckles and a digital metal-gear servo. These premium components provide precise steering response, consistent damping and tuneable suspension characteristics for a wide variety of driving conditions.

Completing the package is a detailed scale-inspired body featuring an integrated roll cage structure, realistic cockpit details, flexible TPU fenders, and front LED headlights. The included full-function Hall sensor transmitter offers smooth and precise throttle and steering control, adjustable steering parameters, built-in gyro control, and selectable speed modes for drivers of all skill levels.

The result is a rugged, race-ready short course truck that combines premium construction, modern electronics and user-friendly maintenance features in an affordable and highly capable platform.

Features

Performance.

• 1/12 scale 4WD brushless short course truck.
• 2845-size 3800KV brushless motor.
• 45A programmable brushless ESC.
• Supports 2S and 3S LiPo batteries.
• Up to 48,000 RPM motor speed.
• XT60 battery connector.
• Forward, brake, and reverse operation.

Drivetrain & Durability.

• Fully sealed transmission system.
• Steel universal-joint driveshafts.
• Steel centre driveshaft.
• Metal transmission gears throughout drivetrain.
• Metal pinion gear (15T, 0.6M).
• Metal spur gear (50T, 0.6M).
• Metal differential ring gear (30T, 0.95M).
• Metal differential bevel gear (10T, 0.95M).
• Metal differential sun gears (16T, 0.8M).
• Metal differential planet gears (8T, 0.8M).
• Independent 4WD drivetrain.
• Debris-resistant gearbox design.

Serviceability.

• Quick-release centre drivetrain access.
• Quick-service differential design.
• Differential removal in under 30 seconds.
• Centre driveshaft replacement in under 30 seconds.
• Quick-release body mounting system.
• Easy-access maintenance architecture.

Suspension & Handling.

• Adjustable aluminium oil-filled shocks.
• Hydraulic shock absorbers.
• Adjustable spring preload.
• Adjustable ride height.
• Adjustable metal steering linkage.
• Dual-ball steering knuckle design.
• Optimized steering geometry.
• Improved suspension articulation and steering angle.

Electronics.

• 17g metal-gear digital servo.
• Servo torque up to 4.5 kg-cm.
• Hall sensor proportional transmitter.
• Built-in gyro/ESP adjustment.
• Steering trim adjustment.
• Steering dual-rate adjustment.
• Throttle and steering reverse functions.
• Low / Medium / High speed modes.
• Smooth, precise steering response.

Scale Details.

• Detailed Sierra short course truck body.
• Through-type roll cage structure.
• Scale cockpit interior.
• Driver figures included.
• Side protective window nets.
• Flexible TPU front and rear fenders.
• Front LED headlights.
• Race-inspired graphics package.

Specifications

Scale: 1/12
Drivetrain: 4WD
Length: 375 mm
Width: 198 mm
Height: 139 mm
Wheelbase: 228 mm
Track Width: 168 mm
Ground Clearance: 30 mm
Tyre Diameter: 73.3 mm
Tyre Width: 30.5 mm
Wheel Hex: 12 mm
Battery Tray Size: 115 × 38 × 25 mm
Motor: 2845 3800KV Brushless
ESC: 45A Brushless (2S–3S LiPo)
Connector: XT60
Servo: 17g Metal Gear Digital Servo
Shock Type: Adjustable Aluminium Hydraulic
Body Material: Polycarbonate (PC)
Transmitter: UA42-E Hall Sensor Radio