Overview
Amped-up ARRMA® RC blasting gets "fun-sized" with the fast, tough, and ready-to-run GRANITE™ GROM 4X4 Monster Truck. At 1/18 scale, it's small enough to take along anywhere, making it the perfect ready to run RC monster truck for those who want genuine ARRMA performance without the bulk. Whether you're enjoying some after-school RC monster truck action with friends, sneaking in a little bashing during your office lunch break, or discovering the world of RC for the first time, the GRANITE GROM easily fits time for ARRMA RC bashing into your way of life. It's tough, fast — and conveniently small.
Unlike many manufacturers of mini RC models, ARRMA made no compromises when shrinking this basher down to small scale size. The GRANITE GROM 4X4 Monster Truck is precision-engineered to the same high standards as larger ARRMA RC vehicles, delivering a big dose of genuine ARRMA performance and durability whenever you get the urge to bash. Whether you're a young beginner or an experienced RC basher, this ready-to-run RC truck offers unprecedented convenience, value, and versatility. Among small scale RC basher models it's in a league of its own, with convenience plus the power, strength, and handling capabilities you need to get serious about your stunts.
Everything you'll need to run the GRANITE GROM comes in the box, including a powerful Spektrum 2S LiPo battery and a safe, easy-to-use Smart charger. The truck body is professionally factory-finished in your choice of three brilliant, durable colour schemes. This is the ideal RC car for UK enthusiasts looking for a compact, durable, and feature-rich ready-to-run platform.
Key Features
- Awesome Monster Truck Styling — The professionally factory-finished body comes in three brilliant, durable colour schemes, giving you genuine monster truck looks in a compact 1/18 scale package that turns heads wherever you take it.
- Clip-Free Body Attachment System — The GRANITE GROM monster truck body snaps onto the chassis easily, quickly, and securely with no tiny clips to force into place. It comes off with a simple press-and-release, making body attachment and removal a system that all ages can successfully manage.
- Tough Metal Gears Throughout — The transmission features a metal spur and crown gears for durability, ensuring carefree bashing in any conditions. Even the installed Spektrum SX110 waterproof steering servo has tough metal gears, protecting your investment against the rigours of off-road bashing.
- Rugged 4-Wheel Drive Transmission — The high-traction 4WD transmission with metal gears carries power from the MEGA 380 brushed motor through an enclosed drivetrain to the tough dBoots® FORTRESS™ monster truck wheels and tyres, ensuring all-terrain protection and reliable power delivery.
- Waterproof Electronics for Any Conditions — The Spektrum SLT™ 2-in-1 25A waterproof ESC and receiver combined with the waterproof Spektrum SX110 metal-geared servo means you can bash in wet conditions without worry, giving you true all-weather RC capabilities.
- Powerful Spektrum 2S LiPo Battery with Smart Charging — The included Spektrum Smart 7.4V 1400mAh 2S 30C hard case LiPo battery provides excellent run times, and the Spektrum S10 Smart G2 Mini 2S USB-C charger handles safe charging automatically in about an hour with intelligent IC2 connectors.
- Easy-to-Use Spektrum 2.4GHz SLT2™ Transmitter — The high-quality 2-channel transmitter is the perfect size for all drivers and includes a training mode that limits maximum speed to 50% or 75%, helping young bashers learn control skills safely before unleashing full speed.
- Durable Composite Chassis with Impact Absorption — The strong composite chassis is protected by impact-absorbing front and rear bumpers, making it bash-ready for serious punishment whilst maintaining the structural integrity you need for reliable performance.
- Independent Suspension with Oil-Filled Shocks — The independent suspension system with oil-filled, coil-over shocks provides excellent off-road handling and bump absorption across rough terrain, ensuring smooth performance whether you're on grass, gravel, or pavement.
- Reliable High-Quality Hex Hardware — All fixings use reliable, high-quality hex hardware that resists vibration and loosening, ensuring your GRANITE GROM maintains its rigidity and performance through countless bashing sessions.
Technical Performance
The ARRMA GRANITE GROM 4X4 delivers impressive performance in a compact package. Powered by the ARRMA MEGA 380 28T brushed motor with a 16-tooth pinion and 59-tooth spur gear, this ready-to-run RC truck achieves a top speed of 20+ mph, providing genuine excitement despite its diminutive 1/18 scale size. The Spektrum SLT 2-in-1 25A waterproof ESC and receiver handle power distribution smoothly, offering forward, brake, and reverse control through the 2.4GHz SLT2™ radio protocol. The 2S LiPo battery system (7.4V 1400mAh 30C hard case) is perfectly matched to the motor, delivering reliable performance and excellent run times from a single charge. The transmission features 0.5MOD gearing with robust metal spur and crown gears, whilst the 4WD drivetrain is fully enclosed for all-terrain protection. The truck measures 250mm in length, 200mm in width, and 118mm in height, with a 165mm wheelbase, making it genuinely portable without sacrificing stability. At 800 grams (1.77 lbs) with battery, it's light enough to carry but substantial enough to feel like a real RC vehicle. Rubber-shielded ball bearings reduce friction and improve reliability, whilst the dBoots® FORTRESS™ tyres provide genuine all-terrain traction. With its independent suspension, oil-filled coil-over shocks, and composite chassis construction, the GRANITE GROM is engineered to withstand serious bashing whilst maintaining precise handling characteristics.
What's in the Box
- 1x GRANITE™ GROM 4X4 Monster Truck RTR (pre-assembled and ready to run)
- 1x Spektrum™ Waterproof SLT™ 2-in-1 25A ESC & Receiver (integrated power and control)
- 1x ARRMA MEGA 380 28T Brushed Motor (installed and ready)
- 1x Spektrum 2.4GHz SLT2™ Transmitter (2-channel radio with training mode)
- 1x Spektrum SX110 Waterproof Metal-Geared Servo (steering)
- 1x Spektrum Smart 7.4V 1400mAh 2S 30C Hard Case LiPo Battery (with IC2® connectors)
- 1x Spektrum S10 Smart G2 Mini 2S USB-C Charger (intelligent charging)
- 4x AA Transmitter Batteries (included for immediate use)
- 1x GRANITE™ GROM 4X4 Monster Truck Product Manual (comprehensive assembly and setup guide)
What You Need to Complete
- 1x USB Power Adapter with QC 2.0/3.0 18W or higher (like the recommended O-GAC65PS Gens Ace 65W Power Supply) — required to power the Spektrum S10 Smart G2 Mini 2S USB-C Charger for recharging your battery
Frequently Asked Questions
- Is the ARRMA GRANITE GROM 4X4 suitable for beginners? — Yes, absolutely. The GRANITE GROM is specifically designed for beginners and experienced bashers alike. The Spektrum 2.4GHz SLT2™ transmitter includes a training mode that limits the truck's maximum speed to 50% or 75% until you're ready for full throttle, helping young drivers learn control skills safely. The clip-free body attachment system is easy for all ages to manage, and the included Spektrum Smart charger makes battery charging worry-free with automatic safety management.
- What battery does the GRANITE GROM need? — The GRANITE GROM comes with a Spektrum Smart 7.4V 1400mAh 2S 30C hard case LiPo battery with IC2® connectors. This 2S LiPo is the recommended and compatible battery type for this truck. The system is designed specifically for 2S LiPo batteries, and the included charger is optimised for this battery chemistry and capacity.
- How long does it take to charge the battery? — The Spektrum S10 Smart G2 Mini 2S USB-C Charger includes intelligent charging technology that automatically manages the charging process for safety and battery longevity. A full charge of the 1400mAh battery takes approximately one hour, allowing you to get back to bashing quickly.
- Is the GRANITE GROM waterproof? — The GRANITE GROM is water-resistant, not fully waterproof. The Spektrum SLT™ 2-in-1 25A waterproof ESC and receiver, combined with the waterproof Spektrum SX110 steering servo, provide significant water resistance for carefree bashing in wet conditions. However, for specific details on waterproof standards and limitations, please refer to the product instruction manuals.
- What's the top speed of the GRANITE GROM? — The GRANITE GROM achieves a top speed of 20+ mph, providing genuine excitement and performance suitable for both indoor and outdoor bashing environments. This speed is achieved through the ARRMA MEGA 380 28T brushed motor, Spektrum SLT 2-in-1 25A ESC, and optimised 0.5MOD gearing system.
- How long will the battery last on a single charge? — The Spektrum Smart 7.4V 1400mAh 2S 30C hard case LiPo battery provides excellent run times for the GRANITE GROM. Actual runtime depends on driving conditions, terrain, and throttle usage, but expect roughly 15-25 minutes of continuous bashing per charge. We recommend purchasing an additional battery for extended play sessions.
- What's the difference between the GRANITE GROM and larger ARRMA models? — The GRANITE GROM is a 1/18 scale version of ARRMA's popular GRANITE monster truck line, bringing genuine ARRMA durability and performance to a compact, portable size. Larger ARRMA models offer more physical size and sometimes more advanced electronics, but the GROM delivers the same precision engineering and bash-ready construction in a fun-sized package that's perfect for taking anywhere. The key difference is size and portability, not quality or durability.
- Can I upgrade the GRANITE GROM with better parts? — Yes, ARRMA offers genuine upgrade parts specifically designed for the GRANITE GROM, including a Metal Axle & Wheel Hub Set, Aluminum Shock Set, Adjustable Steering Links, and a two-piece, assembled Oil-Filled Differential Set. These upgrades allow you to customise and enhance your truck's capabilities.
- How quickly can I get started after opening the box? — The GRANITE GROM is ready-to-run (RTR) and requires less than 1 hour of assembly. Insert the four AA batteries into the transmitter, charge the included Spektrum Smart battery using the USB-C charger, and you're ready to bash. This makes it ideal for immediate gratification and quick setup.
- What's included in the box — do I need to buy anything else? — Everything essential is included: the truck, motor, ESC, receiver, transmitter, servo, battery, and charger. The only additional item you need is a USB power adapter with QC 2.0/3.0 18W or higher (like the recommended Gens Ace 65W supply) to power the charger. All electronics, hardware, and accessories are ready to use immediately.
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 1/18 GRANITE GROM MEGA 4X4 MT with Battery & Charger Blue C-ARA2102T1 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.
