Vortex CK6130 Chain and Sprocket Kit GFRS - GoFast Steel 520 Kit, 1 Down in the Front Stock Steel Rear Fits Yamaha YZF-R6 / S 03-09 Kit Gearing, Ratio 3.2, Front 15 Rear 48 OE Gearing, Ratio 3, Front 16 Rear 48 Kit Components, Front 3271-15, Rear 435S-48, Chain 520SV3-116