RK Vortex Gld O-Ring Stl OE Chain and Sprocket Kit for YZF-R6 03-05 / S 06-09 RK Chain Model: GB530XSOZ1-116 RK Chain Type: Gold O-Ring Vortex Front Sprocket: Steel 16 Tooth Vortex Rear Sprocket: Steel 48 Tooth Bike's Stock Gearing: 16-48