JT Steel Sprockets are the OEM quality choice, manufactured using only the finest grade of C49 high carbon steel for the rear sprockets, and SCM420 chromoly steel alloy for the front sprockets.
Fits:

Yamaha YZF 600R Thundercat 1996, Yamaha YZF 600R Thundercat 1997, Yamaha YZF 600R Thundercat 1998, Yamaha YZF 600R Thundercat 1999, Yamaha YZF 600R Thundercat 2000, Yamaha YZF 600R Thundercat 2001, Yamaha YZF 600R Thundercat 2002, Yamaha YZF 600R Thundercat 2003, Yamaha YZF 600R Thundercat 2004, Yamaha YZF 600R Thundercat 2005, Yamaha YZF 600R Thundercat 2006, Yamaha YZF1000 R Thunde race 2002, Yamaha YZF1000R 1996 - 1997, Yamaha YZF1000R Thunderace 1998 - 1999, Yamaha YZF1000R Thunderace 2000, Yamaha YZF1000R Thunderace 2001, Yamaha YZF1000R Thunderace 2002