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Item #: SPR-4101211FW -
12 Tooth Freewheel Sprocket with 11mm Bore for 1/2"x 1/8" Bicycle Chain Motor sprocket for MY1018Z and MY1016Z3 gear motors. Motor shaft must rotate clockwise to use this sprocket. 1-15/16" (50mm) OD, 11mm ID, 4mm wide x 2mm deep keyway. Works with both 1/2"x1/8" (#410) and 1/2"x3/16" (#415) bicycle chain. (If used with #415 bicycle chain there will be around 1/16" of side-to-side play between the chain and sprocket.) ...