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64 Tooth Rear Sprocket for 8mm Chain 166mm (6-1/2") OD29mm (1.14") ID4mm thick3 bolt mounting patternAdjacent mounting bolt holes are spaced 33mm (1.3") apart from center to centerMounting hole ID 6mmMade from steel with a nickel plated finish.

64 Tooth Sprocket for 8mm Chain 64-tooth 4-hole freewheel sprocket for 8mm (T8F) chain 6.5" OD F4 mounting pattern 2.125" ID 2.559" bolt circle diameter Four 0.244" ID bolt holes Made of zinc-plated steel Sprockets with F4 mounting pattern are compatible with F4 Freewheels.

72 Tooth Sprocket for 8mm Chain 186mm (7-5/16") OD54mm (2-1/8") ID4mm thick.F4 mounting pattern.6.2mm ID bolt holes.Adjacent mounting bolt holes are spaced 47mm (1-3/8") apart from center to center.Made from steel with a zinc plated finish.

74 Tooth Rear Sprocket for 8mm Chain

84 Tooth Sprocket with F4 Mounting Pattern for T8F (8mm) Chain 216mm (8-1/2") OD.54mm (2-1/8") ID.4mm thick. 4 bolt mounting pattern. 6.2mm ID bolt holes. Adjacent mounting bolt holes are spaced 47mm (1.85") apart from center to center. Bolts directly onto our 4-hole and 16-tooth freewheel clutches. F4 mounting pattern.

9 Tooth 10mm D-Bore Sprocket for 1/2" x 1/8" Bicycle Chain 1-5/8" OD.8.5mm x 10mm D-bore ID. Fits 10mm OD single-flatted motor shafts with nut and washer on end to secure sprocket in place. For 1/2" x 1/8" (#410) bicycle chain.

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.) ...

13 Tooth 11mm Bore Sprocket for 1/2"x1/8" and 1/2"x3/16" Bicycle ChainMotor sprocket for MY1018Z and MY1016Z3 gear motors. 2-3/8" (57mm) OD, 11mm ID, 4mm wide x 2mm deep keyway. 9mm wide hub. For 1/2"x1/8" (#410) and 1/2"x3/16" (#415) bicycle chain.http://www.electricscooterparts.com/bicyclesprockets.html

11 Tooth 17mm Dual D-Bore Sprocket for 1/2" x 1/8" Bicycle Chain1-15/16" OD.12mm x 17mm dual D-bore ID.Fits 17mm OD dual flatted motor shaft with nut and washer on end to secure sprocket in place. For 1/2" x 1/8" (#410) bicycle chain.

11 Tooth 17mm Dual D-Bore Sprocket for 1/2" x 3/16" Bicycle Chain1-15/16" OD.12mm x 17mm dual D-bore ID.Fits 17mm OD dual flatted motor shaft with nut and washer on end to secure sprocket in place. For 1/2" x 1/8" (#415 and #415H) bicycle chain.

13 Tooth D-Bore Drive Belt Cog for 5M-15 Belts (8mm Bore) Old item # SPR-COG13D2