UDI RC 1/12 SIERRA 4WD SHORT COURSE TRUCK PRO RTR - GREEN

The UD1203 PRO is a high-performance 1/12 scale brushless short course truck engineered for serious RC enthusiasts who demand durability, speed, and easy maintenance. Built around a rugged shaft-driven 4WD platform, the UD1203 PRO combines race-inspired styling with premium components including a powerful 2845-4700KV brushless motor, programmable 60A ESC, full steel drivetrain, aluminium oil-filled shocks and quick-service drivetrain architecture.

Designed to tackle dirt, gravel, pavement, and mixed-terrain conditions, the UD1203 PRO features fully sealed transmission housings that help protect critical drivetrain components from dust, sand, and debris. Its steel universal driveshafts, metal transmission gears and metal-geared steering servo provide the strength needed to withstand aggressive driving and high-power brushless performance.

Maintenance is faster and easier thanks to innovative quick-release drivetrain and differential assemblies. The modular chassis design allows access to key components in seconds, reducing downtime and simplifying repairs and tuning. Combined with adjustable suspension geometry and hydraulic oil-filled shocks, drivers can fine-tune ride height, handling characteristics and weight transfer for a variety of track conditions.

Power is delivered through a sensorless brushless system capable of reaching motor speeds up to 60,000 RPM. The included programmable 60A ESC supports both 2S and 3S LiPo batteries, allowing drivers to choose between balanced control or maximum performance.

Completing the package is a detailed short course body featuring a removable scale roll cage, moulded cockpit interior, flexible TPU fenders, integrated LED headlights and a Hall-effect steering transmitter with adjustable steering rate, trim, gyro function and multiple speed modes.

Whether you're racing, bashing, or upgrading the UD1203 PRO delivers a premium brushless driving experience with race-inspired engineering and exceptional serviceability.

Features

Performance.

• High-performance 2845-4700KV brushless motor.
• Programmable 60A brushless ESC.
• Supports 2S and 3S LiPo batteries.
• Motor speed up to 60,000 RPM.
• XT60 battery connector.
• Full-time shaft-driven 4WD system.
• Forward / Brake / Reverse operation.
• Multiple speed modes (Low / Medium / High).

Heavy-Duty Drivetrain.

• Full steel drivetrain design.
• Steel universal driveshafts (4 pcs).
• Steel main centre shaft.
• Steel transmission gears.
• Steel differential ring and bevel gears.
• Metal differential internals.
• Steel motor pinion gear.
• Durable steel centre driveline assembly.

Sealed Transmission System.

• Fully enclosed drivetrain housing.
• Helps prevent dirt, sand, and debris contamination.
• Maintains lubrication longer.
• Reduces drivetrain wear.
• Extends bearing and gear life.
• Improves reliability in harsh environments.

Quick-Service Design.

• Quick-release centre drivetrain access.
• Main driveshaft removable in under 30 seconds.
• Differential access in under 30 seconds.
• Modular service-friendly chassis layout.
• Simplifies maintenance and upgrades.

Suspension & Steering.

• Adjustable aluminium oil-filled shocks.
• Hydraulic damping system.
• Adjustable spring preload.
• Adjustable ride height.
• Adjustable metal steering linkages.
• Dual-ball steering knuckle design.
• Improved steering angle and suspension clearance.
• Independent four-wheel suspension.

Electronics.

• 17g metal-gear digital steering servo.
• Rated torque: ≥3 kgf·cm.
• Maximum torque: ≥4.2 kgf·cm.
• Operating voltage: 7.4V.
• Programmable ESC functions.
• Low-voltage protection.
• Automatic cutoff protection.

Scale Details.

• Detailed short course truck body.
• Quick-release body mounting system.
• Integrated scale roll cage.
• Moulded driver cockpit interior.
• Side protective nets.
• Flexible TPU front and rear fenders.
• Front LED headlights.

Advanced Radio System.

• Hall-sensor steering wheel transmitter.
• Contactless steering mechanism.
• Smooth, precise steering feel.
• Adjustable steering trim.
• Adjustable steering dual rate.
• Integrated gyro/ESP adjustment.
• Steering reverse function.
• Throttle reverse function.
• Frequency pairing button.
• Removable battery compartment.
• Supports 2S LiPo transmitter power option.

Specifications

Vehicle Type: 1/12 Brushless 4WD Short Course Truck
Drive System: Shaft-Driven 4WD
Body Material: Polycarbonate (PC)
Length: 375 mm
Width: 198 mm
Height: 139 mm
Wheelbase: 228 mm
Track Width: 168 mm
Tyre Diameter: 73.3 mm
Tyre Width: 30.5 mm
Wheel Hex: 12 mm
Ground Clearance: 30 mm
Motor: 2845-4700KV Brushless
ESC: 60A Brushless (2S–3S LiPo)
Servo: 17g Metal Gear Digital Servo
Battery Tray Size: 115 × 38 × 25 mm
Battery Connector: XT60
Motor Pinion: 10T Steel (0.8M)
Spur Gear: 38T Steel (0.8M)
Differential Ring Gear: 30T Steel (1.0M)
Differential Bevel Gear: 10T Steel (1.0M)
Differential Sun Gear: 16T Metal (0.8M)
Differential Planet Gear: 8T Metal (0.8M)
Main Shaft: Metal
Driveshafts: Steel Universal Joint Type
Shocks: Adjustable Aluminium Hydraulic
Shock Length: 76.3 mm Extended / 58.3 mm Compressed
Radio System: UA42-E Hall-Sensor Transmitter