RK Vortex O-Ring Blk QA Chain and Sprocket Kit SV650 99-08 / S 99-07 / SF 08-09 RK Chain Model: 520XSO-110 RK Chain Type: Gun Metal O-Ring Vortex Front Sprocket: Steel 14 Tooth Vortex Rear Sprocket: Black Alum 45 Tooth Bike's Stock Gearing: 15-45 / 44