Vortex CK2135 Chain and Sprocket Kit GFRS - GoFast Steel 520 Kit, 1 Down in the Front Stock Steel Rear Fits Honda CBR600RR 03-06 Kit Gearing, Ratio 2.87, Front 15 Rear 43 OE Gearing, Ratio 2.69, Front 16 Rear 43 Kit Components, Front 3273-15, Rear 251AS-43, Chain 520SV3-112