Vortex CK2138 Chain and Sprocket Kit GFRS - GoFast Steel 520 Kit, 1 Down in the Front Stock Steel Rear Fits Honda CBR600RR 07-15 Kit Gearing, Ratio 2.8, Front 15 Rear 42 OE Gearing, Ratio 2.63, Front 16 Rear 42 Kit Components, Front 3273-15, Rear 251AS-42, Chain 520SV3-112