Vortex CK6302 Chain and Sprocket Kit HFRS - Hyper Fast Steel 520 Kit, 1 Down in the Front, 2 Up Steel Rear Fits Kawasaki ZX-10R 11-15 Kit Gearing, Ratio 2.56, Front 16 Rear 41 OE Gearing, Ratio 2.29, Front 17 Rear 39 Kit Components, Front 3270-16, Rear 452AS-41, Chain 520RV3-112