This hard plastic wheel is specially designed for the Solarbotics GM2, GM3, GM8, and GM9 gear motor output shafts.
It also fits on Pololu plastic gearmotors (although the included screw might be too short for these motors).
While the GMW wheel can function as a wheel all by itself, the four convenient mounting holes
also let you use this as a wheel adapter to attach a larger wheel, or to attach legs and other mechanisms to your gearmotor.

Solarbotics GMW GM2/3/8/9 Gear Motor Mount - ONE mount

This plastic robot wheel is 1-3/16" (30 mm) in diameter, 0.28" (7 mm) wide,
and the double-flat slot fits snuggly onto the shafts of the Solarbotics gearmotors
and Pololu plastic gearmotors listed under the related products on this web page.
 

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