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Pololu Wheel 70x8mm Pair – Blue are designed to press-fit securely onto the 3mm D output shafts on many of Pololu gearmotors, including Pololu micro metal gearmotors and mini plastic gearmotors. They also work with Pololu 35:1 and 115:1 15.5D metal gearmotors. Pololu Wheel 70x8mm Pair – Blue has silicone tires and measure 70 mm (2.36″) in diameter. Two additional mounting holes for 4-40 screws make it possible to use the wheel with our universal mounting hubs for 3mm shafts, 4mm shafts, and 5mm shafts. The slots in the five spokes allow additional accessories to be mounted to the wheel (e.g. decorations or parts of an encoder system).
Pololu Web Site: https://www.pololu.com/product/1425