A 2838-size 4500Kv brushless motor from Spektrum's Firma range, fitted as original equipment across the Arrma Grom 223S platform. The low-cog 4-pole rotor gives smoother throttle response at low speed than a 2-pole design, which counts on small-scale cars where the power delivery is easy to overwhelm.

Construction is CNC machined aluminium housing, insulated high-purity copper windings, precision bearings, and an alloy steel 3.17mm (1/8in) output shaft.

Direct replacement for

• Typhon Grom 223S DSC 4X4 RTR Brushless Buggy 1/14 (ARA2306, ARA2306S)
• Mojave Grom 223S DSC 4X4 RTR Brushless Desert Truck 1/16 (ARA2304, ARA2304S)

Also listed for these brushed Grom vehicles

• Typhon Grom 4X4 RTR Brushed Buggy 1/14 (ARA2106)
• Granite Grom 4X4 RTR Brushed Monster Truck 1/18 (ARA2102)
• Mojave Grom 4X4 RTA Kit Brushed Desert Truck 1/16 (ARA2104K)
• Quake Grom 4X4 RTR Brushed Monster Truck 1/16 (ARA2137)
• Freedom Flyer Grom 4X4 RTR Brushed Monster Truck 1/16 (ARA2130)

If your vehicle came with a brushed motor, fitting this also requires a compatible brushless ESC — the standard brushed ESC will not run it.

Shaft size

3.17mm (1/8in), not the 5mm used on larger Firma motors. Check your pinion before ordering.

Specifications

Size: 2838
Kv: 4500
Poles: 4
Type: brushless
Output shaft: 3.17mm (1/8in) alloy steel
Housing: CNC machined aluminium
Contents: 1 motor