Vortex CK6134 Chain and Sprocket Kit GFRS - GoFast Steel 520 Kit, 1 Down in the Front Stock Steel Rear Fits Yamaha YZF-R6 06-15 Kit Gearing, Ratio 3, Front 15 Rear 45 OE Gearing, Ratio 2.81, Front 16 Rear 45 Kit Components, Front 3271-15, Rear 435S-45, Chain 520SV3-114