UDIRC Sierra UD1203 1/12 4WD Brushless Short Course Truck RTR

The UDIRC Sierra UD1203 is a high-performance 1/12 scale 4WD brushless short course truck designed for fast off-road driving, bashing and racing across dirt, gravel, grass and hard surfaces.

Powered by a 2845 3800KV brushless motor and programmable 45A brushless ESC, the Sierra delivers strong acceleration and impressive speed while maintaining a compact and durable design.

The UD1203 combines a fully sealed drivetrain, metal transmission components, adjustable aluminium hydraulic shocks and a tough polycarbonate body to create a capable RC truck that's built for high-speed off-road driving.

3800KV Brushless Motor

The Sierra is equipped with a 2845 3800KV brushless motor.

The motor provides strong acceleration and responsive throttle control while remaining well suited to both 2S and 3S LiPo operation.

The motor is paired with a 45A brushless ESC with an XT60 battery connector.

2S–3S LiPo Compatible

The UD1203 supports 2S and 3S LiPo batteries.

With a suitable 2S battery, the truck can reach approximately 38km/h, while 3S power can increase performance to approximately 55km/h, depending on battery, gearing, surface and driving conditions.

The battery compartment measures approximately:

115 × 38 × 25mm

Full-Time 4WD

The Sierra features a 4WD drivetrain designed to maximise traction during high-speed off-road driving.

The drivetrain uses metal gears and a metal main driveshaft to handle the output of the brushless power system.

The front and rear drivetrain components are designed for easy access and maintenance.

Fully Sealed Metal Drivetrain

The UD1203 features a robust drivetrain incorporating metal components throughout the key power-transfer areas.

Features include:

• 15T metal motor pinion
• 50T metal main drive gear
• Metal differential ring gear
• Metal differential bevel gears
• Metal main shaft
• Steel universal joint dogbones
• Sealed drivetrain

The quick-access design makes maintenance and replacement of drivetrain components easier.

Adjustable Aluminium Hydraulic Shocks

The Sierra is equipped with adjustable aluminium hydraulic shock absorbers front and rear.

The oil-filled shocks help absorb bumps and impacts while maintaining better control over rough terrain.

The threaded shock bodies also allow suspension ride height and spring preload to be adjusted.

Durable Polycarbonate Body

The Sierra features a tough polycarbonate body shell designed to withstand the demands of off-road driving.

The thickened PC body provides good impact resistance while keeping the vehicle lightweight.

The body and chassis components use tough nylon materials designed to resist cracking during normal RC use.

Adjustable Metal Steering Linkage

The steering system uses adjustable metal linkage to provide precise steering control.

A 17g metal gear steering servo provides responsive steering input and is designed to cope with the demands of high-speed driving.

Large Off-Road Tyres

The UD1203 uses large off-road tyres designed to provide traction across a variety of surfaces.

The tyres are approximately 73.3mm in diameter and 30.5mm wide, providing a good balance between grip, stability and ground clearance.

Front LED Headlights

The Sierra includes a front LED lighting system, adding visibility and scale appearance when driving in lower-light conditions.

Quick-Access Maintenance Design

The UD1203 has been designed with maintenance in mind.

The body shell, differential and driveshaft assemblies incorporate quick-release features, allowing easier access to key components when servicing or replacing parts.

This makes the Sierra particularly convenient for regular RC enthusiasts who want easy access to the drivetrain.

Key Features

• UDIRC Sierra UD1203
• 1/12 scale
• 4WD short course truck
• Brushless power system
• 2845 3800KV brushless motor
• 45A programmable brushless ESC
• 2S–3S LiPo compatible
• Approximately 38km/h on 2S
• Approximately 55km/h on 3S
• Fully sealed drivetrain
• Metal transmission gears
• Metal main driveshaft
• Steel universal joint dogbones
• Adjustable aluminium hydraulic shocks
• Adjustable metal steering linkage
• 17g metal gear steering servo
• Tough polycarbonate body
• Nylon suspension components
• Large off-road tyres
• Front LED headlights
• Quick-release body and drivetrain components
• 2.4GHz radio system
• RTR – Ready to Run

Specifications

• Brand: UDIRC
• Model: Sierra UD1203
• Product Code: UDI-UD1203
• Vehicle Type: Short Course Truck
• Scale: 1/12
• Drive: 4WD
• Motor: 2845 3800KV Brushless
• ESC: 45A Brushless
• Battery: 2S–3S LiPo
• Battery Connector: XT60
• Steering Servo: 17g Metal Gear
• Motor Pinion: 15T 0.6M Metal
• Main Drive Gear: 50T 0.6M Metal
• Differential: Metal Gear
• Transmission: Sealed
• Shock Absorbers: Adjustable Aluminium Hydraulic
• Tyre Diameter: 73.3mm
• Tyre Width: 30.5mm
• Wheel Hex: 12mm
• Wheelbase: 228mm
• Track Width: 168mm
• Length: 375mm
• Width: 198mm
• Height: 139mm
• Battery Compartment: 115 × 38 × 25mm
• Radio System: 2.4GHz
• Top Speed: Approximately 38km/h on 2S / 55km/h on 3S

What's Included

• UDIRC Sierra UD1203 RC truck
• 2845 3800KV brushless motor
• 45A brushless ESC
• 17g metal gear steering servo
• 2.4GHz transmitter
• Receiver
• Front LED lighting
• Adjustable aluminium hydraulic shocks
• Polycarbonate body
• Off-road tyres
• Basic tools
• User manual

Battery and charger configuration can vary between package versions, so please check the specific product packaging before listing a battery as included.

Battery Required

The UD1203 is compatible with 2S–3S LiPo batteries.

For maximum performance, a suitable 3S LiPo battery can be used.

The battery compartment measures approximately 115 × 38 × 25mm, so check your battery dimensions before purchasing.

Ready-to-Run Performance

The UDIRC Sierra UD1203 delivers an excellent combination of brushless performance, 4WD traction and durable construction in a compact 1/12 scale package.

With a 3800KV brushless motor, 45A ESC, metal drivetrain, aluminium hydraulic shocks and quick-access maintenance design, the Sierra is ready for fast off-road driving and everyday RC bashing.

Please note: Actual speed will vary depending on battery, gearing, surface, tyre condition and driving conditions.