22T 40Cr Motor Gear MG222T/0.5M (Module 0.5mm, 2.2mm Motor Hole) by GPM  [MG222T/0.5M]

Technical Summary of the Pinion

The 40Cr steel 22T motor gear is an RC pinion intended for small electric motors with a module 0.5mm gear mesh. Its hardened black treatment increases surface hardness and reduces wear under common model loads, while the rounded motor hole accommodates a 2.2mm motor tooth diameter.

Installation notes: secure the gear to the motor shaft using the two included 3x3 set screws, and ensure the motor shaft and tooth diameter match the round hole spec. Check mesh with the corresponding module 0.5mm spur and confirm the 22T fits the gearbox before final assembly.

Tuning role: this compact pinion is useful when altering final drive ratios in electric models; swapping between pinions with the same module and motor tooth size lets you dial acceleration or top speed without changing the motor or spur gear.