Overview
Unlock advanced gear-ratio tuning on your Arrma 1/18 Grom with the Hot Racing Adjustable Aluminum Motor Mount. CNC-machined from solid aluminum, this adjustable mount replaces the fixed-position factory plastic motor mount (Arrma ARA320744), allowing precise gear mesh adjustment when running non-standard pinion gears between 16T and 30T (with the stock 59T spur gear).
For racers, bashers, and tuners chasing custom gear ratios for top-end speed, harder acceleration, or improved efficiency, this adjustable mount is essential — it's the only way to achieve perfect gear mesh outside the stock pinion range. The CNC aluminum body also dissipates heat far better than plastic, helping keep your motor cooler under sustained load.
Key Features
- CNC-machined aluminum construction
- Adjustable mounting position for custom 16T–30T pinion ratios
- Direct replacement for Arrma ARA320744 plastic motor mount
- Improves heat dissipation versus stock plastic mount
- Compatible with the stock 59T spur gear
Performance Benefits
- Enables custom gearing for top-speed or acceleration tuning
- Perfect gear mesh for quieter operation and longer gear life
- More rigid than stock plastic motor mount
- Better motor cooling under sustained load
Usage Notes
Required for any pinion/spur combination outside the stock gearing range. Always verify gear mesh by spinning the drivetrain by hand — there should be a small amount of backlash with no binding. For an easy stock-gear-ratio setup, consider Hot Racing GRM18V01 as an alternative. Apply medium thread-locker on motor mount screws.
Technical Specs
- Material: CNC-machined aluminum
- Pinion Range (with stock 59T spur): 16T – 30T
- Function: Adjustable motor mount
- Replaces: Arrma ARA320744 plastic motor mount
What's Included
- One (1) adjustable aluminum motor mount
- One (1) pivot collar set
- Two (2) motor mount screws
Fitment
- Arrma 1/18 Grom (all variants using ARA320744 motor mount)
Summary
The Hot Racing Adjustable Aluminum Motor Mount is the gateway to custom gearing on the Arrma 1/18 Grom. For tuners chasing the perfect ratio — or bashers running upgraded motors that demand custom gear mesh — it's the part you can't go without.
