Granite Grom Mega 380 Brushed 4x4 Monster Truck RTR w/ Battery & Charger (Blue)

By:arrma rc vehicles

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Amped-up ARRMA® RC blasting gets "fun-sized" with the fast, tough, and ready-to-run GRANITE&trade 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&trade monster truck wheels and tires. Even the Spektrum&trade SX110 steering servo has metal gears &mdash and, like the IC2® connector-equipped Spektrum SLT&trade 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&trade 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.



  • 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



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!



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.



  • Approximate Assembly Time     Less than 1 Hour
  • Body     Pre-painted, Decaled
  • Brakes     Integral with ESC
  • Pinion     16T
  • Scale     1/18
  • 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+
  • Product Weight     1.77lb (800g) with Battery
  • Tire Tread     dBoots® FORTRESS&trade
  • Vehicle Type     Monster Truck
  • Charger     Included
  • Receiver     Included
  • Battery     Included
  • Connector Type     IC2
  • Motor Size     380 28T
  • Product Length     9.84" (250 mm)
  • Spur Gear     59T
  • Suspension     Independent
  • Water-Resistant     Yes
  • Power System     MEGA
  • Product Width     7.87" (200 mm)
  • Radio     Included
  • Technology     SLT Protocol
  • Power Type     Electric
  • Gear Pitch     0.5MOD
  • Servos     Included
  • Motor Type     Brushed
  • Speed Control     Included
  • Wheelbase     6.5" (165 mm)
  • Shock Type     Oil-Filled, Coil-Over Springs



  • (1) GRANITE&trade GROM 4X4 Monster Truck RTR
  • (1) Spektrum&trade Waterproof SLT&trade 2-in-1 25A ESC & Receiver
  • (1) ARRMA MEGA 380 28T Brushed Motor
  • (1) Spektrum 2.4GHz SLT2&trade 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&trade GROM 4X4 Monster Truck Product Manual


Needed to Complete

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


Used with permission, copyright ©2023 ARRMA®/Horizon Hobbies, Inc.® Copyright ©2023 Brey Corp. t/a Hobby Works.®



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