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, this is the perfect RC car for UK enthusiasts who want genuine ARRMA performance and durability in a compact, portable package. Small enough to take along anywhere—whether that's the park, your garden, or even your office lunch break—the GRANITE GROM delivers a big dose of authentic ARRMA engineering and quality whenever you get the urge to bash. This ready-to-run RC monster truck is precision-engineered to the same high standards as larger ARRMA RC vehicles, with absolutely no compromises made in shrinking this basher down to small scale size.
Whether you're a young beginner discovering the world of RC for the first time or an experienced RC basher looking for a fun, portable alternative to larger models, the GRANITE GROM easily fits time for ARRMA RC bashing into your way of life. Unlike many manufacturers of mini RC models that sacrifice quality for size, ARRMA has engineered this 1/18 scale monster truck with the same attention to detail, durability and performance you'd expect from a larger model. It's tough, fast, and conveniently small—making it one of the best ready-to-run RC trucks available in the UK market today.
This complete RTR (ready-to-run) package includes everything you need to get started immediately: a powerful Spektrum 2S LiPo battery, a safe and easy-to-use Smart charger, a 2.4GHz radio system, and a fully assembled, professionally finished chassis with no building required. The clipless body mount design keeps the body securely attached but makes it incredibly easy to remove for all drivers, young and old alike.
Key Features
- Awesome Monster Truck Styling with Three Colour Choices — The GRANITE GROM comes with a professionally factory-finished truck body available in three brilliant, durable colour schemes. Each option features authentic monster truck aesthetics with realistic graphics and premium paint finishes that look fantastic right out of the box.
- Powerful Spektrum 2S LiPo Battery and Safe, Easy-to-Use Smart Charger — The included Spektrum Smart 7.4V 1400mAh 2S 30C hard case LiPo battery provides excellent runtime for extended bashing sessions. The included Spektrum S10 Smart G2 Mini 2S USB-C Charger uses intelligent smart technology to automatically manage the charging process safely and completely in approximately one hour, so you don't have to worry about overcharging or damaging your battery.
- Easy Body Attachment and Removal with Clipless Design — The GRANITE GROM features a revolutionary clipless body mounting system that snaps onto the chassis easily, quickly, and securely with just a simple press-and-release action. With no tiny clips to force into place, this innovative body attachment system that all ages can successfully manage means faster battery changes and more time bashing.
- Enclosed Drivetrain for All-Terrain Protection — The fully enclosed drivetrain protects all internal components from dirt, debris, mud, and water damage, allowing you to bash with confidence in virtually any outdoor condition without worrying about contaminants affecting performance or reliability.
- Reliable, High-Quality Hex Hardware — Every bolt, screw, and fastening point on the GRANITE GROM uses precision-engineered hex hardware that stays tight during intense bashing sessions and resists vibration loosening, ensuring consistent performance and reliability.
- Durable Composite Chassis — The strong composite chassis provides an excellent balance of weight savings and durability, absorbing impacts and punishment whilst remaining lightweight enough for fast, responsive handling across all terrain types.
- High-Traction 4WD Transmission with Robust Metal Gears — The high-traction four-wheel drive transmission features rugged metal gears that carry power from the MEGA 380 brushed motor through an enclosed drivetrain to the wheels. This metal geared transmission delivers superior durability and performance compared to plastic alternatives, making it perfect for serious bashing.
- Tough Metal Gears Throughout — Beyond the transmission, even the installed Spektrum SX110 steering servo has tough metal gears, ensuring that every moving part of this RC monster truck is engineered for carefree bashing in any conditions without fear of stripped plastic gears.
- Independent Suspension with Oil-Filled, Coil-Over Shocks — The independent suspension system with oil-filled coil-over shocks provides responsive handling, excellent bump absorption, and predictable performance on rough terrain, rocks, jumps, and obstacles.
- Tough Monster Truck Wheels and Tyres — The GRANITE GROM is fitted with dBoots® FORTRESS™ monster truck wheels and tyres that deliver powerful looks and all-terrain traction, giving the truck authentic monster truck aesthetics whilst providing genuine off-road grip.
- Impact-Absorbing Front and Rear Bumper — Heavy-duty bumpers at both the front and rear of the chassis absorb impacts from crashes and obstacles, protecting the main chassis structure during intense bashing sessions and extending the life of the vehicle.
- Spektrum SLT2 2-Channel 2.4GHz Radio System — The high-quality Spektrum SLT2 two-channel 2.4GHz transmitter is the perfect size for all drivers and includes an innovative training mode that helps you learn control skills safely by limiting the monster truck's maximum speed to 50% or 75% until you're ready to handle full power.
- Spektrum SLT 2-in-1 25A Waterproof ESC and Receiver — This integrated electronic speed controller and radio receiver combination eliminates the need for separate components, reducing weight and complexity whilst providing waterproof protection for carefree bashing in wet conditions.
- Spektrum SX110 Waterproof Metal-Geared Servo — The precision metal-geared servo handles steering duties with impressive accuracy and reliability, and its waterproof rating means you can bash through wet grass, mud puddles, and creek crossings without concern.
- Water-Resistant Construction Throughout — The entire electrical system and key components feature water-resistant designs, allowing you to enjoy RC bashing in damp conditions without fear of damage to electronics or loss of performance.
Technical Performance
The ARRMA GRANITE GROM 4X4 Monster Truck RTR is engineered and manufactured to exacting standards of durability and performance. At 1/18 scale, this compact ready-to-run RC truck measures 250mm in length, 200mm in width, 118mm in height, and weighs just 800g including the battery, making it incredibly portable for UK bashers who want to take their RC action anywhere. The power system features an ARRMA MEGA 380 28-tooth brushed motor paired with a Spektrum SLT 2-in-1 25A waterproof ESC and receiver, delivering a top speed of 20+ mph whilst maintaining excellent control and responsiveness. The 4WD drivetrain uses a 16-tooth pinion gear driving a 59-tooth spur gear with 0.5MOD gear pitch, providing optimal power delivery and acceleration characteristics. The high-traction four-wheel drive transmission with metal gears ensures power reaches all four wheels through an enclosed drivetrain, whilst the independent suspension with oil-filled coil-over shocks provides excellent articulation and bump absorption. The Spektrum Smart 7.4V 1400mAh 2S 30C hard case LiPo battery delivers impressive runtime for extended bashing sessions, recharging fully in approximately one hour using the included USB-C Smart charger. With a 6.5-inch wheelbase, the GRANITE GROM offers a compact footprint ideal for tight spaces and technical terrain whilst maintaining excellent stability. The entire electrical system uses IC2 connectors for reliable, secure connections, and the combination of waterproof ESC, waterproof servo, and water-resistant construction means this ready-to-run RC monster truck can handle bashing in challenging British weather conditions and diverse terrain types without hesitation.
What's in the Box
- GRANITE™ GROM 4X4 Monster Truck RTR (fully assembled and ready to run)
- Spektrum™ Waterproof SLT™ 2-in-1 25A ESC & Receiver
- ARRMA MEGA 380 28T Brushed Motor
- Spektrum 2.4GHz SLT2™ Transmitter
- Spektrum SX110 Waterproof Metal-Geared Servo
- Spektrum Smart 7.4V 1400mAh 2S 30C Hard Case LiPo Battery with IC2® connectors
- Spektrum S10 Smart G2 Mini 2S USB-C Charger
- Four AA Transmitter Batteries
- GRANITE™ GROM 4X4 Monster Truck Product Manual
What You Need to Complete
- USB Power Adapter with QC 2.0/3.0 18W+ (such as Gens Ace 65W Power Supply) — required to power the USB-C Smart charger if you don't have a compatible QC 2.0/3.0 USB adapter available
Frequently Asked Questions
- Is the ARRMA GRANITE GROM suitable for beginners and children? — Absolutely. The GRANITE GROM is specifically designed as a ready-to-run solution perfect for beginners and young drivers. It comes fully assembled with no building required, includes a training mode on the transmitter that limits speed to 50% or 75% until you build confidence, and features beginner-friendly controls with the Spektrum SLT2 2-channel radio system. The clipless body mounting system and included charger make maintenance and battery changes simple for all ages. If you're new to RC cars in the UK, this is an excellent entry point into the hobby.
- What battery does the GRANITE GROM use and how long does it run? — The truck comes with a Spektrum Smart 7.4V 1400mAh 2S 30C hard case LiPo battery that provides excellent runtime for extended bashing sessions. The battery recharges completely in approximately one hour using the included Spektrum S10 Smart G2 Mini 2S USB-C Charger with intelligent smart technology that automatically manages the charging process safely. The specific runtime will vary depending on driving style and terrain, but you can expect 15-30 minutes of continuous bashing on a single charge.
- Is the GRANITE GROM waterproof? — The GRANITE GROM features water-resistant construction throughout, with a waterproof Spektrum SLT 2-in-1 25A ESC and receiver, plus a waterproof Spektrum SX110 metal-geared servo. The enclosed drivetrain provides all-terrain protection from dirt and debris. However, it is classified as water-resistant rather than fully waterproof, meaning it can handle wet conditions, damp grass, and light rain without issues, but it should not be submerged. For specific details on waterproof standards, please refer to the product instruction manual.
- How fast does the GRANITE GROM go? — With its ARRMA MEGA 380 28-tooth brushed motor and Spektrum SLT 2-in-1 25A ESC, the GRANITE GROM achieves a top speed of 20+ mph, which is genuinely quick for a 1/18 scale ready-to-run monster truck. The speed is perfectly controlled through the responsive Spektrum radio system, and you can limit maximum speed to 50% or 75% whilst learning.
- What makes this better than other 1/18 scale RC trucks? — Unlike many manufacturers of mini RC models that compromise on quality, ARRMA made no compromises when shrinking the GRANITE down to small scale size. Every component—from the metal-geared transmission and metal-geared servo to the dBoots® FORTRESS™ wheels and enclosed drivetrain—is engineered to the same high standards as larger ARRMA vehicles. The clipless body mounting system is unique and user-friendly, the included Spektrum Smart 2S LiPo battery and charger eliminate battery hassles, and the 2-year limited warranty provides peace of mind. For UK buyers seeking genuine ARRMA quality in a portable, ready-to-run package, the GRANITE GROM is in a league of its own.
- Is this ready to run right out of the box? — Yes, completely. The GRANITE GROM is a true ready-to-run (RTR) model that arrives fully assembled with no building required. The truck comes professionally factory-finished with all electronics installed and tested, the battery is charged and ready to go, and the charger is included. The only external item you may need is a USB power adapter with QC 2.0/3.0 18W+ to power the charger, though many modern phone chargers will work.
- What radio system does this use? — The GRANITE GROM uses the Spektrum 2.4GHz SLT2™ radio system, which operates on the proven SLT protocol. This is a reliable, interference-resistant 2-channel system perfect for monster truck driving. The transmitter includes innovative training mode features to help beginners build confidence, and it uses four AA batteries which are included in the box.
- Can I upgrade or modify the GRANITE GROM? — Yes. ARRMA offers various upgrade parts available separately, including a Metal Axle & Wheel Hub Set, Aluminum Shock Set, Adjustable Steering Links, and a two-piece, assembled Oil-Filled Differential Set. These allow you to customise and enhance your GRANITE GROM's performance and capabilities as your skills develop.
- What's the warranty on this RC truck? — The ARRMA GRANITE GROM 4X4 Monster Truck RTR comes with a 2-year limited warranty covering manufacturing defects. For full details on warranty coverage, terms, and exclusions, please refer to the manufacturer's website or contact RC Model Shop directly.
- Is assembly required? — No. The GRANITE GROM is a ready-to-run (RTR) model that arrives completely assembled with all electronics installed, tested, and ready for immediate use. Assembly time is listed as less than one hour only if you need to install batteries or make minor adjustments, but the vehicle itself requires no building or construction.
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 Green C-ARA2102T3 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.
