Sprocket,Trn.310"Offset Kit 24 Tooth Bt 4 Spd W/Disc Brake Sprocket & Wheel Spacer W/Hrdw This Transmission Sprocket and Rear Sprocket Offset Spacer Kit eases the pain of installing wider rear tires. Kit includes a chrome plated rear sprocket spacer, .310 thick, and chrome mounting hardware designed for use with flange type steel rear wheel hub. When using on models with an open primary, a belt drive style transmission mainshaft bearing support must be used. When using electric start a rear belt drive style inner primary and appropriate starter motor must be used. As with any wide tire application always check all clearances.