Vortex CK6345 Racing Sprocket Kit HFRS - Hyper Fast Steel 520 Kit, 1 Down in the Front, 2 Up Steel Rear Fits Honda CBR600RR 03-06 Kit Gearing, Ratio 3, Front 15 Rear 45 OE Gearing, Ratio 2.69, Front 16 Rear 43 Kit Components, Front 3273-15, Rear 251AS-45, Chain 520SV3-112