Pololu 80x10 mm Multi-Hub Robot Wheels, Black, Pair - Silicone Tyres for 3 mm and 4 mm Shafts

Specs: 80 mm diameter x 10 mm wide silicone tyres; black ABS wheel disc (Pololu FAQ: hubs ABS PA-747; tyres on all Pololu wheels except 42x19 mm are silicone rubber); interchangeable collets for 3 mm D, 3 mm round, 4 mm D, 4 mm round shafts; grip tightens as collet is compressed into the wheel; shafts at least 7.5 mm long (collet + plate about 6 mm thick); hole spacing also works with Pololu larger Universal Mounting Hubs (6 mm+); weight 23 g - FLAG, opened #3690 page did not restate weight in fetched text, treat as search-extract level, not opened-page verified.

Compatibility: 3 mm D-shafts on Pololu micro metal and mini plastic gearmotors; 4 mm D-shafts on Pololu 20D and 25D metal gearmotors. Pairs directly with the 298:1 motor (R14, 3 mm D-shaft).

Power: No power - passive wheel/tyre.

Package contents: Pair of wheels; per wheel: silicone tyre, black ABS wheel disc, 4 black ABS collet inserts (3 mm D, 3 mm round, 4 mm D, 4 mm round), threaded metal collet plate, three 7 mm M3 screws.