Vortex CK6229 Chain and Sprocket Kit GFRA - GoFast Aluminum 520 Kit, 1 Down in the Front Stock Aluminum 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 435K-48, Chain 520SV3-116