GRANITE™ GROM 4X4 Monster Truck RTR

Product Details


In The Box
  • (1) GRANITE™ GROM 4X4 Monster Truck RTR
  • (1) Spektrum™ Waterproof SLT™ 2-in-1 25A ESC & Receiver
  • (1) ARRMA MEGA 380 28T Brushed Motor
  • (1) Spektrum 2.4GHz SLT2™ Transmitter
  • (1) Spektrum SX110 Waterproof Metal-Geared Servo
  • (1) Spektrum Smart 7.4V 1400mAh 2S 30C Hard Case LiPo Battery
  • (1) Spektrum S10 Smart G2 Mini 2S USB-C Charger
  • (4) AA Transmitter Batteries
  • (1) GRANITE™ GROM 4X4 Monster Truck Product Manual


Needed to Complete
  • (1) USB power adapter with QC 2.0/3.0 18W+

User Manual GRANITE™ GROM 4X4 Download


  • Awesome monster truck styling with three color choices
  • Powerful Spektrum 2S LiPo battery & safe, easy-to-use charger
  • Easy body attachment and removal
  • Enclosed drivetrain for all-terrain protection
  • Reliable, high-quality hex hardware
  • Durable composite chassis
  • High-traction 4WD transmission
  • Tough metal gears
  • Independent suspension and oil-filled, coil-over shocks
  • Tough monster truck wheels and tires
  • Impact-absorbing front and rear bumper
  • Spektrum SLT2 2-channel 2.4GHz radio
  • Spektrum SLT 2-in-1 25A waterproof ESC and receiver
  • Spektrum SX110 waterproof metal-geared servo
  • 2-Year limited warranty (see website for details)


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. And the GRANITE GROM delivers a big dose of genuine ARRMA performance and durability whenever you get the urge to bash.

Enjoy some after-school RC monster truck action with friends. Sneak in a little bashing during your office lunch break. Whether you're a young beginner or an experienced RC basher, 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. It also has a clipless body mount design that keeps the body securely attached but easy to remove for all drivers, young and old. 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.

The ARRMA GRANITE GROM 4X4 Monster Truck endures any punishment you can dish out. Impact-absorbing front and rear bumpers are the bash-ready bookends to its strong composite chassis. A 4WD transmission with robust metal gears carries power from the MEGA 380 brushed motor through an enclosed drivetrain to the tough dBoots® FORTRESS monster truck wheels and tires. Even the Spektrum SX110 steering servo has metal gears — and, like the IC2® connector-equipped Spektrum SLT 2-in-1 25A ESC and receiver, it's waterproof for carefree bashing in any conditions.

If you're a first-time RC basher, the Spektrum 2.4GHz SLT2 transmitter helps you learn control skills safely by limiting the monster truck's maximum speed to 50% or 75% until you're ready to handle it all. Recharging the included Spektrum Smart 2S LiPo battery is also worry-free. Just plug it into the supplied Spektrum S10 Smart G2 Mini 2S USB-C Charger with the attached IC2 connectors. Smart technology instantly takes care of the rest. In about an hour, your battery is safely recharged and ready for another round of fun.

Everything you'll need to the run the GRANITE GROM comes in the box. The truck body is professionally factory-finished in your choice of three brilliant, durable color schemes. GRANITE GROM upgrade parts are available for cranking up its capabilities past eleven. They include a Metal Axle & Wheel Hub Set, Aluminum Shock Set, Adjustable Steering Links, and a two-piece, assembled Oil-Filled Differential Set.

Take advantage of small scale value and versatility with the GRANITE GROM 4X4 Monster Truck RTR, and experience ARRMA RC bashing excellence for yourself.



The ARRMA GRANITE GROM 4X4 Monster Truck RTR is engineered and manufactured to the same high standards of durability and performance that you expect from any ARRMA vehicle. It's just smaller!

Monster Truck


Right out of the box, the monster truck body comes professionally factory-finished in your choice of three brilliant, durable color schemes. Tough dBoots® FORTRESS monster truck wheels and tires add powerful looks and all-terrain traction.



The GRANITE GROM monster truck body snaps onto the chassis easily, quickly, and securely. It comes off with a simple press-and-release. With no tiny clips to force into place, it's a body attachment system that all ages can successfully manage.

 transmission is fully metal geared


Enjoy carefree bashing with your ARRMA GRANITE GROM monster truck in any conditions. The transmission is fully metal geared for durability. Even the installed Spektrum SX110 waterproof steering servo has tough metal gears.

4 Wheel Drive


The high-traction 4-wheel drive transmission features rugged metal gears. It carries power from the installed MEGA 380 brushed motor to the wheels through an enclosed drivetrain. The entire power system is well-protected for dependable performance on all terrain.



The high-quality Spektrum SLT2 2-channel transmitter is the perfect size for all drivers. It can help you learn control skills safely by limiting the monster truck's maximum speed to 50% or 75% until you're ready for it all. Four AA batteries included.

Battery and Charger


The Spektrum Smart 2S LiPo battery with IC2 connectors provides the power for long run times. When it's time to recharge, just plug it into the convenient Spektrum Smart G2 S10 USB-C Charger. Safe charging begins automatically and only takes about an hour.

Product Specifications

Power System MEGA
Product Width 7.87" (200 mm)
Radio Included
Technology SLT Protocol
Product Weight 1.77lb (800g) with Battery
Tire Tread dBoots® FORTRESS™
Vehicle Type Monster Truck
Water-Resistant Yes
Battery Included
Connector Type IC2
Motor Size 380 28T
Product Length 9.84" (250 mm)
Spur Gear 59T
Suspension Independent
Pinion 16T
Scale 1/18
Approximate Assembly Time Less than 1 Hour
Body Pre-painted, Decaled
Brakes Integral with ESC
Ball Bearings Rubber-shielded Bearings
Chassis Composite
Completion Level Ready-To-Run
Drivetrain 4WD
Drive Type Forward/Brake/Reverse
Product Height 4.65" (118 mm)
Top Speed 20+
Power Type Electric
Gear Pitch 0.5MOD
Servos Included
Charger Included
Receiver Included
Shock Type Oil-Filled, Coil-Over Springs
Motor Type Brushed
Speed Control Included
Wheelbase 6.5" (165 mm)
Barcode # 5052127047135
Brand Arrma
Shipping Weight 2.5000kg
Shipping Width 0.250m
Shipping Height 0.200m
Shipping Length 0.320m
Shipping Cubic 0.016000000m3

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