Overview
Step up to unstoppable 4x4 monster truck bashing with the 1/10 scale ARRMA GRANITE MEGA 665 4X4 RTR. This is the ready-to-run brushed monster truck that offers amped-up power and toughness straight out of the box, making it an ideal choice for anyone looking to get into RC car UK hobby without the complexity of assembly. Whether you're new to the world of RC vehicles or you're looking to upgrade from a smaller model, the GRANITE MEGA 665 delivers unbeatable 4x4 grip and impressive performance capabilities that grow right along with your skills.
The updated GRANITE MEGA 665 4x4 takes the popular brushed monster truck's impressive capabilities to the next level. Now equipped with an 11% larger MEGA 665 brushed motor and a 3S brushless-ready transmission, it represents a significant step up from its predecessor. This combination delivers higher torque, improved efficiency, and the flexibility to upgrade to brushless power whenever you're ready—making it a genuinely future-proof investment in your RC hobby. The high-torque MEGA 665 brushed motor is accompanied by an aluminium heatsink and 35mm cooling fan to boost efficiency and power output, ensuring consistent performance during extended bashing sessions.
There's no better way to start your off-road bashing power trip than with the ARRMA GRANITE, and this RTR (ready-to-run) version eliminates the frustration of assembly—just add a battery and charger, and you're ready to hit the dirt. The all-terrain suspension with oil-filled, coilover shocks soaks up bumps beautifully, whilst the multi-surface dBoots Fortress MT tyres provide awesome traction across all conditions. Extended height side guards on the strong composite chassis keep onboard components free of dirt and debris, and the realistic, aggressive GRANITE body uses a clipless body retention system to preserve its stunning looks.
Key Features
- Ready-to-run design — Only battery and charger required to get started, with no time-consuming assembly or technical setup needed. Perfect for those wanting to jump straight into the action.
- High-torque MEGA 665 brushed motor — This 11% larger motor compared to the 550-size predecessor delivers increased power and torque, with an aluminium heatsink and 35mm cooling fan to maximise efficiency and prevent overheating during extended use.
- 3S brushless-ready transmission — The transmission is engineered to accept a brushless motor upgrade, allowing you to increase performance and efficiency significantly whenever you choose to upgrade in future without requiring transmission replacement.
- Maintenance-free overload coupling — An intelligent torque limiter protects the transmission from excessive torque damage, eliminating the need for slipper clutch maintenance and keeping your RC truck running reliably.
- All-terrain independent suspension with oil-filled coilover shocks — Purpose-designed to soak up bumps and impacts across rough terrain, with adjustable ride height to increase ground clearance for uneven surfaces and obstacles.
- Waterproof electronics package — The Spektrum SLT 2-in-1 40A LiPo-ready ESC and receiver are fully waterproof, allowing confident bashing in wet conditions without electronics failure concerns.
- Spektrum SLT2 2.4GHz transmitter — Features a foam wheel for precise fingertip control, fatigue-free handling, and programmable throttle limits at 50% or 75% for less experienced drivers learning to master the full speed potential.
- S661 metal-gear digital servo — Delivers 125 oz-in of torque at 6V, providing precise, powerful steering response for tight control even in aggressive bashing scenarios.
- Multi-surface dBoots Fortress MT tyres — These vented tyres provide exceptional traction across dirt, gravel and short grass, with vent holes that improve grip and allow water and dirt to escape. Mounted on tough nylon wheels with foam inserts for superior grip and handling.
- Aggressive GRANITE monster truck body — Factory-finished in bold colour schemes with a hidden clipless body retention system that preserves the realistic, detailed styling without visible fasteners.
- Ventilated composite chassis — Keeps onboard components cool during extended use, with higher side guards providing maximum protection from dirt and debris ingestion.
- Impact-absorbing bumpers — Front and rear bumpers cushion impacts with obstacles, reducing damage and extending the lifespan of your truck.
- Driveshaft stone guard — Protects the driveshaft from debris strikes during off-road bashing, a critical protection feature for serious bashers.
- Adjustable battery straps — Accommodate various 2S hardcase LiPo battery formats within the specified maximum dimensions of 138 x 51 x 48mm.
- Two-year limited warranty — ARRMA's confidence in build quality is backed by comprehensive warranty coverage.
Technical Performance
The GRANITE MEGA 665 4X4 delivers impressive performance across the board. Powered by the high-torque MEGA 665 brushed motor with its aluminium heatsink and 35mm cooling fan, this 1/10 scale monster truck achieves top speeds of 20+ mph, providing genuine thrills whether you're exploring your local park or setting up jumps and ramps at dedicated RC bashing grounds. The brushed motor technology offers immediate throttle response and excellent low-end torque, making it responsive and fun to drive for both beginners and experienced pilots. The drivetrain features a 2.85 internal gear ratio with a 15T pinion and 57T spur gear, engineered for balanced acceleration and top speed performance on varied terrain. The 4WD system with independent suspension ensures excellent traction and stability, particularly valuable on uneven surfaces and during cornering at speed.
The electrical system is centred around the Spektrum SLT 2-in-1 40A ESC and receiver with IC3 connectors, offering full waterproof protection for worry-free bashing in any conditions. This ESC is LiPo-ready and compatible with 2S hardcase LiPo batteries up to maximum dimensions of 138 x 51 x 48mm, with minimum specifications of 5000mAh at 30C discharge rating. The system uses the Spektrum SLT protocol on 2.4GHz frequency for interference-free operation. The all-terrain suspension features oil-filled, coilover shock absorbers that provide exceptional bump absorption and can be adjusted for ride height tuning to suit different terrain types. The multi-spoke wheels feature 14mm hex sockets for tyre changes, paired with the dBoots Fortress MT vented tyres that deliver superior traction across all surface types.
Dimensionally, this ready-to-run RC monster truck measures 470mm in length, 340mm in width, and 204mm in height, with a wheelbase of 284mm. The model weighs 3.47kg, providing enough mass for stability and durability without excessive inertia. The strong composite chassis features ventilation holes to keep electronics cool, extended side guards for component protection, and a centralised battery mounting system with adjustable straps. The chassis is water-resistant, making it suitable for bashing near water and in wet conditions, though not suitable for full submersion.
What's in the Box
- GRANITE MEGA 665 4x4 1/10 Scale Monster Truck RTR (fully assembled)
- Spektrum SLT 2-in-1 40A LiPo Ready Waterproof ESC & Receiver with IC3 Connectors
- MEGA 665 14T High Torque Brushed Motor with ARRMA Heatsink & Cooling Fan
- Spektrum SLT2 2.4GHz Transmitter
- Spektrum S661 Waterproof Metal Gear Digital Servo
- Four AA Transmitter Batteries
- Moulded Hand Tools (2.0mm and 2.5mm)
- Instruction Manual (multilingual)
What You Need to Complete
- 1 x 2S Hardcase LiPo Battery (5000mAh minimum at 30C, maximum dimensions 138 x 51 x 48mm with EC3/IC3 connector)
- Compatible LiPo battery charger
- LiPo Safe Charging Bag for secure battery storage and charging
Frequently Asked Questions
- Is the ARRMA GRANITE MEGA 665 good for beginners? — Yes, absolutely. This ready-to-run design requires no assembly, making it perfect for newcomers to RC hobbies. The transmitter includes programmable throttle limits at 50% or 75%, allowing beginners to learn at reduced speeds before accessing the full performance. The robust construction and waterproof electronics mean it can handle enthusiastic driving without fear of electronic failure. Its stable 4WD suspension and generous ground clearance make it forgiving on rough terrain.
- What battery does the GRANITE MEGA 665 need? — The truck requires a single 2S hardcase LiPo battery with IC3 connector. The maximum dimensions are 138 x 51 x 48mm (6.5 x 2.01 x 1.89 inches), and minimum specifications are 5000mAh capacity at 30C discharge rating. A compatible LiPo charger and safe charging bag are also required but sold separately.
- Can this be upgraded to brushless power? — Yes, one of the standout features is the 3S brushless-ready transmission included as standard. You can upgrade to a brushless motor and ESC system at any time for improved efficiency and greater power output, with the transmission simply accepting the new components without any modifications needed.
- What is the top speed of this monster truck? — The GRANITE MEGA 665 achieves top speeds of 20+ mph in standard brushed configuration. This is quick enough for exciting bashing but not so fast as to be uncontrollable for newer pilots. Speed can be increased further with a future brushless upgrade.
- How does the overload coupler work? — Instead of using a traditional slipper clutch that requires regular maintenance, the GRANITE MEGA 665 includes a maintenance-free overload coupling (torque limiter). This intelligently protects the transmission from excessive torque damage when landing jumps or hitting obstacles, automatically engaging and disengaging as needed. This means less maintenance and more reliable, worry-free operation.
- What makes the suspension adjustable? — The oil-filled, coilover shock absorbers can have their ride height adjusted to increase or decrease ground clearance. This is useful for adapting to different terrain types—increase clearance for rough, uneven ground with rocks and roots, or lower it on smooth surfaces for better handling. This tuning capability adds significant versatility to the truck.
- Is this truck waterproof? — The electronics are water-resistant with fully waterproof Spektrum ESC and receiver components, making the truck suitable for bashing in wet conditions, near water, and in rain. However, full waterproofing is not rated for complete submersion, so avoid driving through deep water crossings.
- What is included in the transmitter package? — The Spektrum SLT2 2.4GHz transmitter features a foam wheel for ergonomic, fatigue-free control, programmable throttle limiting for learners, and four AA batteries. The 2.4GHz frequency ensures interference-free operation across crowded bashing areas.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ARRMA 1/10 GRANITE MEGA 665 4X4 RTR Monster Truck Green today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
