100mm Small rubber wheel with 1.5mm shaft hole. Ideal for solarollers!
Originally designed as capstan roller for cassette tapes (remember those), they've found a second life as high-performance wheels for tiny robots and in our own SolarSpeeder kit.
If you're planning to use these as coasting wheels, they roll quite nicely on standard 0.055" music wire. And our PRet plastic retainers do a good job of holding them in place.