Front and Rear Sprocket Kit. Compatible with following Yamaha models: R1 YZF-R1 2004-2005 / R1 YZF-R1 2006-2008 / R1 YZF-R1 SP 2006. Part number: 14B-25447-20-00. Order Includes: Front Sprocket 17 Teeth / Material: Steel, Rear Sprocket 45 Teeth / Material: C49 High Carbon Steel. We strongly suggest comparing the posted picture to the unit(s) that needs to be replaced..
