Vortex CK6151 Chain and Sprocket Kit GFRS - GoFast Steel 520 Kit, 1 Down in the Front Stock Steel Rear Fits Yamaha YZF-R1 06-08 Kit Gearing, Ratio 2.81, Front 16 Rear 45 OE Gearing, Ratio 2.65, Front 17 Rear 45 Kit Components, Front 3289-16, Rear 435S-45, Chain 520RV3-118