Overview
Step up to unstoppable 4x4 monster truck bashing with the 1/10 scale ARRMA GRANITE MEGA 665 RTR. This is one of the most impressive ready to run RC cars available on the UK market today, offering genuine performance and durability straight out of the box. Whether you're a weekend basher, a first-time RC enthusiast, or someone looking to upgrade from a smaller model, this brushed monster truck delivers the kind of power and traction that makes every outing unforgettable. Now equipped with an 11% larger brushed motor and a 3S brushless-ready transmission, it offers performance and power that grow right along with your skills.
There's no better way to start your off-road bashing power trip than with the ARRMA GRANITE. This updated GRANITE MEGA 665 4x4 takes the popular brushed monster truck's impressive capabilities to the next level. Unlike entry-level RC vehicles, this model is engineered with serious durability in mind. The all-terrain suspension, reinforced composite chassis, and high-quality Spektrum electronics ensure that whether you're tackling dirt, gravel, or short grass, you've got a vehicle that can handle real-world bashing conditions. Later, when you're ready for even bigger performance, upgrading this ready to run RC truck to a brushless power system is drop-in easy.
Bash with unbeatable 4x4 grip when you choose the ARRMA GRANITE MEGA 665 – a ready-to-run brushed monster truck that offers amped-up power and toughness. The hidden clipless body retention system preserves the truck's realistic, aggressive looks while keeping the body secure during hard landings. This is the kind of RC monster truck that delivers genuine thrills, whether you're a beginner discovering the world of RC for the first time or an experienced driver looking for a dependable platform for casual weekend bashing.
Key Features
- 11% Larger MEGA 665 High-Torque Brushed Motor — This motor represents a significant upgrade from the 550-size motor found on predecessor models, delivering more power and torque to tackle varied terrain. The 14-turn brushed design is proven reliable and delivers the kind of consistent performance that makes bashing predictable and fun.
- 3S Brushless-Ready Transmission — The transmission is already equipped to handle brushless upgrades whenever you decide to step up in power. This future-proofing means your ready to run RC truck can evolve with your experience level without requiring a complete rebuild.
- Maintenance-Free Overload Coupling — Instead of a traditional slipper clutch that requires regular adjustment and maintenance, this monster truck uses an overload coupling (torque limiter) that protects the transmission from excessive torque while remaining completely maintenance-free. This means more time bashing and less time in the workshop.
- Aluminium Motor Heatsink and 35mm Cooling Fan — These cooling components work together to boost motor efficiency and power output, keeping temperatures down during extended bashing sessions and ensuring reliable performance even on hot days or during aggressive driving.
- Waterproof Spektrum Electronics Package — The included SLT 2-in-1 40A LiPo-ready ESC and receiver are fully waterproof, meaning you can bash through puddles, splashes, and morning dew without worrying about electronic failure. This waterproofing is essential for genuine all-terrain RC use.
- Spektrum SLT2 2.4GHz Transmitter — This transmitter is perfectly balanced for fatigue-free bashing and features a foam wheel for precise fingertip control. Less experienced bashers can set the throttle limits at 50% or 75% until ready to use the monster truck's full speed potential, making it genuinely suitable for skill progression.
- Spektrum S661 Metal-Gear Digital Servo — Producing 125 oz-in of torque at 6V, this waterproof metal-gear servo delivers precise, powerful steering that responds immediately to your inputs, even on rough terrain or during aggressive manoeuvres.
- Aggressive GRANITE Monster Truck Body with Hidden Clipless Retention — The factory-finished body comes in several bold colour schemes and uses an innovative clipless body retention system that keeps the body secure without visible hardware, preserving the truck's realistic, aggressive appearance.
- Ventilated Composite Chassis with Extended Side Guards — The durable composite chassis features ventilation holes to keep onboard components cool and includes extended-height side guards that provide maximum protection from dirt and debris during off-road bashing. This robust construction extends the life of your electronics and reduces maintenance needs.
- All-Terrain Oil-Filled Coilover Shock Package — The super-tough independent suspension with oil-filled, coilover shocks absorbs bumps and impacts, soaking up the punishment that comes with serious bashing. This is genuine suspension engineering, not a budget compromise.
- Adjustable Ride Height — If your bashing takes you over particularly uneven surfaces, you can adjust the ride height to increase ground clearance, giving you flexibility to tackle different terrain types without modification.
- Multi-Surface dBoots FORTRESS MT Tyres — These tyres feature an advanced tread pattern designed to work across multiple surface types, from dirt to gravel to short grass. Vent holes in the tyres allow air to move freely, improving traction and allowing water and dirt to escape, preventing hydroplaning and maintaining grip in wet conditions.
- Tough Multi-Spoke Nylon Wheels with Foam Inserts — The 14mm hex wheels feature foam inserts that improve grip and handling without requiring adhesive, and the tough nylon construction resists cracking and damage from hard landings.
- Impact-Absorbing Bumpers and Shock Tower Protector — These protective elements are designed to absorb the energy from collisions and hard impacts, protecting the chassis and critical components from damage during aggressive bashing.
- Driveshaft Stone Guard — This guard protects the driveshaft from damage caused by small rocks and debris picked up during off-road driving, a practical feature that extends the life of drivetrain components.
- Adjustable Battery Straps — The straps are designed to securely hold your 2S hardcase LiPo battery while remaining adjustable to accommodate different battery sizes within the specified dimensions.
- Ready-to-Run Completion Level — This ready to run RC truck comes almost completely assembled and requires only the addition of a 2S LiPo battery and compatible charger to get bashing. No assembly knowledge or tools are required beyond what's included.
- Two-Year Limited Warranty — ARRMA stands behind this product with comprehensive warranty coverage, providing peace of mind that your investment is protected against manufacturing defects.
Technical Performance
The ARRMA GRANITE MEGA 665 4x4 is engineered as a genuine all-terrain brushed monster truck capable of sustained performance across varied bashing environments. At 1/10 scale with a length of 470mm and a wheelbase of 284mm, it offers the kind of size that's genuinely manoeuvrable in most spaces while still providing a substantial platform for tricks and high-impact bashing. The weight of 3.47kg is well-balanced, neither so light that it's blown around by wind nor so heavy that it's difficult to manoeuvre.
The motor specification is particularly impressive: the MEGA 665 14-turn brushed motor with 15T pinion is significantly more capable than the 550-size motors found in entry-level offerings. The aluminium heatsink and 35mm cooling fan ensure sustained performance even during continuous running, preventing thermal throttling that can plague lesser designs. The motor is paired with a 57-tooth spur gear and a 2.85:1 internal gear ratio, delivering a top speed of 20+ mph – fast enough to be genuinely exciting without being so fast that it's uncontrollable for newer drivers. The motor connects through a waterproof IC3 connector to the Spektrum SLT 2-in-1 40A ESC, a proven, reliable unit that can handle the demands of brushed motorsport without the cost premium of brushless electronics.
The transmission deserves specific attention: this 4WD mid-motor layout with a 2.85:1 gear ratio has been proven reliable across thousands of bashers worldwide. The inclusion of a 3S brushless-ready transmission means the internal gearing and drivetrain components can accept a modern brushless motor upgrade without replacement, giving this ready to run RC truck genuine longevity and upgrade potential. The overload coupling eliminates the need for slipper clutch maintenance while protecting against damage from excessive torque – a genuine engineering improvement over earlier designs.
Battery compatibility is straightforward: the truck accepts a single 2S hardcase LiPo battery with IC3 connector, maximum dimensions of 138 x 51 x 48mm and minimum specifications of 5000mAh at 30C discharge rate. This standardisation makes battery selection easy and options readily available from multiple suppliers across the UK. The waterproof electronics, including the Spektrum S661 servo with 125 oz-in torque at 6V, ensure reliability in wet or dusty conditions.
The suspension geometry employs oil-filled, coilover shock absorbers on all four corners, providing both vertical compliance and adjustable ride height. The independent suspension design ensures each wheel maintains ground contact across rough terrain, improving traction and stability compared to solid-axle competitors. The ventilated chassis with extended side guards protects components while allowing airflow to cool electronics, and the driveshaft stone guard prevents drivetrain damage from small rocks and debris commonly encountered during off-road driving.
What's in the Box
- GRANITE MEGA 665 4x4 1/10 Scale Monster Truck RTR (fully assembled and painted)
- Spektrum SLT 2-in-1 40A LiPo Ready Waterproof ESC & Receiver with IC3 Connectors
- MEGA 665 14T High Torque Brushed Motor with ARRMA Aluminium Heatsink & 35mm Cooling Fan
- Spektrum SLT2 2.4GHz Transmitter (2.4GHz frequency, 2-in-1 radio protocol)
- Spektrum S661 Waterproof Metal Gear Digital Servo
- Four AA Transmitter Batteries
- Moulded Hand Tools (2.0mm and 2.5mm hex)
- Instruction Manual (multilingual)
- LiPo Safe Charging Bag
What You Need to Complete
- One 2S Hardcase LiPo Battery (maximum dimensions 138 x 51 x 48mm, minimum 5000mAh at 30C – IC3 connector)
- One Compatible LiPo Battery Charger (AC charger recommended for convenience)
Frequently Asked Questions
- Is the ARRMA GRANITE MEGA 665 suitable for beginners new to RC monster trucks? — Yes, absolutely. This ready to run RC truck is specifically designed with progression in mind. It arrives 95% assembled, requiring only battery and charger. The Spektrum SLT2 transmitter allows you to limit throttle to 50% or 75% until you've developed the car control skills needed for full speed operation. The 4WD design provides excellent stability and traction, reducing the likelihood of crashes caused by loss of grip. The waterproof electronics mean that even minor mishaps in wet conditions won't destroy your investment. This is genuinely one of the best choices for someone discovering RC for the first time.
- What battery does the GRANITE MEGA 665 require and how long does it run? — This ready to run RC truck requires a single 2S LiPo battery (7.4 volts) with an IC3 connector. Maximum dimensions are 138 x 51 x 48mm and minimum capacity is 5000mAh at 30C discharge rate. Using a 5000mAh battery at moderate driving pace, you can expect approximately 15-20 minutes of continuous running before the battery requires recharging. Many bashers purchase two batteries and an AC charger to minimise downtime between sessions.
- Can I upgrade this to brushless power in the future? — Yes, this is one of the key advantages of the GRANITE MEGA 665. The transmission is 3S brushless-ready, meaning the internal gearing and drivetrain are designed to accept a modern brushless motor upgrade without modification or replacement. When you're ready to step up to brushless performance, you'll simply swap the motor and ESC – no transmission replacement needed. This future-proofing means your ready to run investment today can evolve into a high-performance platform tomorrow.
- How does the overload coupling work and why is it better than a slipper clutch? — The overload coupling (torque limiter) is a mechanical device that protects the transmission by slipping when torque exceeds a safe threshold. Unlike slipper clutches that require regular adjustment and generate heat that must be dissipated, the overload coupling is completely maintenance-free and produces minimal heat. This means you spend less time in the workshop adjusting components and more time actually bashing. It's a genuine engineering improvement proven reliable across ARRMA's professional product lines.
- What makes the Spektrum electronics package reliable for off-road bashing? — All the included Spektrum components are fully waterproof, rated for wet and dusty conditions. The SLT 2-in-1 ESC is LiPo-ready, meaning it automatically detects battery type and configures itself appropriately. The S661 servo uses metal gears instead of plastic, providing both precision and durability for steering inputs in rough terrain. These components are used extensively in professional racing and competitive bashing, so reliability has been proven under serious conditions.
- What surface types can I bash on with the GRANITE MEGA 665? — This ready to run RC truck is designed for multi-surface use including dirt, gravel, and short grass. The dBoots FORTRESS MT tyres feature a tread pattern optimised for varied terrain, and vent holes in the tyres help maintain traction by allowing water and mud to escape. The oil-filled coilover suspension and adjustable ride height mean you can adapt to different terrain – increase ride height for very rough or rocky ground, or lower it for smooth surfaces. The ventilated chassis and extended side guards protect electronics during dusty or muddy conditions.
- How does this compare to other 1/10 brushed monster trucks? — The GRANITE MEGA 665 stands out through its combination of specifications and engineering choices. The 11% larger MEGA 665 motor is more powerful than typical 550-size designs, the overload coupling eliminates slipper clutch maintenance, the 3S brushless-ready transmission provides upgrade potential, and the complete Spektrum electronics package is waterproof and proven reliable. The independent suspension with adjustable ride height offers genuine versatility, and the clipless body retention system preserves appearance while keeping the body secure. At its price point, this represents genuine value as a ready to run RC truck.
- Is assembly required or does it arrive ready to use? — The GRANITE MEGA 665 arrives as a ready-to-run (RTR) vehicle with zero assembly required. The chassis is fully assembled, the motor and transmission are installed, the electronics are wired, and the body is painted and fitted. You simply add a charged 2S LiPo battery with IC3 connector, insert the four AA batteries in the transmitter, and you're ready to bash. The included hand tools are only needed for future maintenance or adjustments, not initial setup.
- What warranty does ARRMA provide with this ready to run monster truck? — ARRMA includes a two-year limited warranty with this product, covering manufacturing defects in materials and workmanship. This warranty demonstrates manufacturer confidence in the product design and component quality, and provides peace of mind that your investment is protected against unforeseen defects.
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 GRANITE MEGA 665 1/10 Brushed 4WD Monster Truck – Blue – C-ARA4202V4T2 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.
