This custom-designed plastic wheel from Pololu has a silicone tire measuring 1.26" (32 mm) in diameter and is designed to fit the output shafts on our micro and mini metal gearmotors as well as the Solarbotics metal gear motors.
Both the Micro Metal Gearmotor Bracket and Extended Micro Metal Gearmotor Bracket will work with this wheel.
Sold as two wheels.