How to find the right RC Electric Motors & Parts AI guide

Written by an AI model from its trained knowledge.

What the AI looks for in RC Electric Motors & Parts

Shaft diameter to pinion bore: Small 540-size and 380-size motors usually use a 3.175mm (1/8 inch) shaft. Larger eighth-scale and big-block motors usually use 5mm. Buy pinions whose bore matches the shaft exactly. A mismatched bore cannot be shimmed reliably and will slip or wobble, which strips gears.
Gear pitch match: The pinion pitch must equal the spur gear pitch: 48P, 32P, Mod 0.6, Mod 0.8 or Mod 1. Pitch and module are not interchangeable even when they look close. Mixed pitches mesh badly and chew through the spur gear within minutes.
Heat sink and fan sizing: Match the heat sink's inner diameter to the motor can diameter. 540 cans are typically about 36mm, and larger cans are 40mm or more. A loose heat sink does not transfer heat, and one that is too tight will not fit.
Sensor cable compatibility: Sensored systems use a standard 6-pin sensor harness. Length matters more than brand. A cable that is too short strains the connector, and a damaged sensor wire causes cogging at low speed.
Bearing size and seal type: Replace motor bearings with the exact size listed in the motor manual. Rubber-sealed bearings suit bashers and dusty conditions. Metal-shielded bearings suit clean racing. Worn motor bearings are the most common cause of new noise and heat in an otherwise healthy brushless motor.

Castle Creations: Motors, sensor cables and motor-ESC combos, with a strong range for larger vehicles.
Hobbywing: Wide range of motors and combos, from budget to race-grade, plus fans and accessories.
Tekin: Race-focused sensored motors and replacement parts such as rotors and bearings.
Reedy: Team Associated's motor brand, with spec-class race motors and rotors.
Robinson Racing: Well-regarded pinion gears in many pitches and shaft bores.
Holmes Hobbies: Crawler-specialist brushed and brushless motors.
ProTek RC: Motor fans, heat sinks and accessories.

Pinions sold without a clearly stated pitch and bore.
Aluminum pinions for high-power or heavy vehicles, because they wear quickly; use hardened steel instead.
Unbranded heat sinks that do not list an inner diameter.

Only if the motor mount and pinion fit. You need pinions with a 5mm bore, and the larger can often will not fit a small motor mount.