ARRMA BIG ROCK 223S 4X4 1/10 RTR Brushless Monster Truck

The ARRMA BIG ROCK 223S 4X4 is a tough and versatile 1/10 scale 4WD brushless monster truck built for high-speed off-road driving, jumps, wheelies and serious RC bashing.

The ARA4312V4 features ARRMA's latest 223S brushless power system, giving drivers the flexibility to run either 2S or 3S LiPo batteries. On 3S, the BIG ROCK is capable of 50+ mph / 80+ km/h, delivering impressive acceleration and high-speed performance.

With its long-wheelbase chassis, large dBoots RAGNAROK tyres, oil-filled aluminium shocks, centre differential and rugged 4WD drivetrain, the BIG ROCK is designed to handle a wide range of off-road conditions.

Spektrum 223S Brushless Power

The BIG ROCK 223S is powered by a Spektrum 3100Kv brushless motor paired with a Spektrum 223S Smart 2-in-1 ESC/receiver system.

The system is compatible with both 2S and 3S LiPo batteries, allowing drivers to start with more manageable 2S performance and progress to the full 3S experience.

On 3S, the BIG ROCK can reach 50+ mph / 80+ km/h under suitable conditions.

Dynamic Stability Control

The BIG ROCK 223S incorporates Spektrum Dynamic Stability Control (DSC).

DSC helps the truck maintain control when driving on loose or slippery surfaces by making automatic steering corrections.

The system can be adjusted to suit the driver's preference or switched off for a more direct driving experience.

The included Spektrum SLT3 transmitter also features adjustable throttle limiting, making it easier for newer drivers to learn before using full power.

Oil-Filled Centre Differential

The BIG ROCK 223S features an oil-filled centre differential.

The centre differential helps distribute power between the front and rear axles, improving traction and handling during acceleration.

It also helps provide smoother power delivery and reduces drivetrain stress when transitioning between different surfaces.

Heavy-Duty 4WD Drivetrain

The 4WD drivetrain is designed to handle the torque generated by the 3100Kv brushless motor.

The BIG ROCK uses three gear differentials and durable drivetrain components to provide reliable power delivery during aggressive bashing.

The centre differential power module is removable, making drivetrain servicing and maintenance easier.

Rugged Composite Chassis

The BIG ROCK uses a strong moulded composite chassis designed for off-road abuse.

The chassis incorporates reinforced suspension mounting areas and captured hinge pins to help improve durability.

A dedicated chassis dirt-drain system helps remove dirt and debris from inside the chassis.

Long-Wheelbase Design

The BIG ROCK uses a 327 mm wheelbase, providing excellent stability during high-speed driving.

Compared with shorter-wheelbase ARRMA stunt trucks, the BIG ROCK's longer chassis provides a more planted feel and predictable handling.

The wide 356 mm overall width further improves stability when cornering and driving across uneven terrain.

Aluminium Oil-Filled Shocks

The BIG ROCK 223S features large aluminium-body oil-filled coil-over shocks.

The shocks provide controlled damping over bumps, jumps and rough terrain while maintaining traction.

The suspension can be tuned using different shock oils, springs and mounting positions.

dBoots RAGNAROK Tyres

The BIG ROCK comes equipped with aggressive dBoots RAGNAROK tyres.

The large tyres are designed for high-traction off-road driving across dirt, grass, gravel and other suitable surfaces.

Their aggressive tread provides strong forward and lateral grip while the large diameter helps the truck clear rough terrain.

Clipless Body System

The BIG ROCK features a convenient clipless body mounting system.

The body can be removed quickly without traditional body clips, making battery changes and maintenance easier.

The clipless design also gives the truck a cleaner appearance and eliminates loose body clips.

Spektrum SLT3 Radio System

The included Spektrum SLT3 2.4GHz transmitter provides reliable control and useful adjustment options.

Features include:

• 50% throttle limit
• 75% throttle limit
• 100% throttle
• Adjustable steering rate
• DSC adjustment
• Ergonomic grip
• Foam steering wheel

Key Features

• 1/10 scale ARRMA BIG ROCK 223S
• ARA4312V4
• 4WD brushless monster truck
• Ready-to-Run
• Spektrum 3100Kv brushless motor
• Spektrum 223S Smart 2-in-1 ESC/receiver
• Dynamic Stability Control
• 2S and 3S LiPo compatible
• 50+ mph / 80+ km/h on 3S
• Oil-filled centre differential
• Three gear differentials
• Heavy-duty 4WD drivetrain
• Rugged composite chassis
• Aluminium motor plate
• Removable centre differential power module
• Clipless body system
• Aluminium oil-filled coil-over shocks
• dBoots RAGNAROK tyres
• 17 mm wheel hexes
• Spektrum SLT3 transmitter
• IC5 connector
• Water-resistant electronics

Specifications

• Brand: ARRMA
• Model: BIG ROCK 223S 4X4
• Part Number: ARA4312V4
• Scale: 1/10
• Vehicle Type: Monster Truck
• Drive: 4WD
• Power Type: Electric Brushless
• Completion Level: Ready-to-Run
• Power System: 223S
• Motor: Spektrum 3100Kv Brushless
• ESC/Receiver: Spektrum 223S Smart 2-in-1
• Radio: Spektrum SLT3 2.4GHz
• Drivetrain: 4WD
• Differentials: Front, Centre and Rear
• Centre Differential: Oil-Filled
• Shock Type: Aluminium Body, Oil-Filled Coil-Over
• Chassis: Composite
• Tyres: dBoots RAGNAROK
• Wheel Hex: 17 mm
• Connector: IC5
• Battery Compatibility: 2S or 3S LiPo
• Maximum Battery Dimensions: 165 × 51 × 48 mm
• Length: 514 mm
• Width: 356 mm
• Height: 201 mm
• Wheelbase: 327 mm
• Weight: 3.55 kg without battery
• Top Speed: 50+ mph / 80+ km/h
• Water Resistant: Yes
• Surface: Off-Road

ARRMA's current specifications list the BIG ROCK at 514 mm long, 356 mm wide, 201 mm high, with a 327 mm wheelbase and 3.55 kg weight. The maximum battery dimensions are 165 × 51 × 48 mm.

Battery & Charger Required

The BIG ROCK 223S is supplied Ready-to-Run, but battery and charger are sold separately.

Compatible battery options:

• 1 × 2S LiPo
• 1 × 3S LiPo

For maximum performance, a suitable 3S LiPo battery is recommended.

The battery must fit within the maximum available dimensions of approximately 165 × 51 × 48 mm.

A compatible LiPo charger and LiPo charging bag are also recommended.

What's Included

• ARRMA BIG ROCK 223S 4X4 1/10 RTR Monster Truck
• Spektrum 3100Kv Brushless Motor
• Spektrum 223S Smart ESC/Receiver
• Spektrum SLT3 2.4GHz Transmitter
• Steering Servo
• dBoots RAGNAROK Tyres
• Factory-finished clipless body
• Rear bumper
• Instruction manual
• Transmitter batteries

Built for High-Speed Off-Road Bashing

The ARRMA BIG ROCK 223S 4X4 is an excellent all-round brushless monster truck for drivers who want a combination of speed, durability and easy handling.

The long-wheelbase chassis provides excellent stability while the 3100Kv brushless motor and 223S Smart electronics deliver up to 50+ mph / 80+ km/h performance on 3S.

With its oil-filled centre differential, heavy-duty 4WD drivetrain, aluminium shocks, large RAGNAROK tyres and rugged composite chassis, the BIG ROCK is ready for everything from casual backyard driving to aggressive off-road bashing.

Please note: This is a high-performance brushless RC vehicle. Always operate in a large, open and suitable area away from people, traffic and obstacles. Follow all manufacturer instructions regarding LiPo batteries, charging and safe operation.