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SG-S501 8-speed internal gear hub for CenterLock disc or rim brake use (shifter, brake, and mounting hardware sold separately)3/8"x26tpi solid axle for 135mm rear dropouts (187mm overall length) Hub system has a 307% gear ratio differential and uses a silent, double-roller clutch mechanism as well as a shifting power modulator*Mounting hardware necessary for installation (washers/nuts, cassette joint) USE SH-31980 CS-500 sprocket and chain tensioner sold separately (USE SH-42901/42902)1680gdescription: CS-500 3/32" sprocket20Taxle: -hole: -color: silver/black