Ultralight Rear Sprocket Renthal Rear Ultralight Sprockets: Manufactured to extremely tight tolerances from a special material developed to withstand the stress of Supercross, Motocross and Enduro. 7075 T6 aluminum alloy rear chainwheels are 66% lighter than steel, yet incredibly durable. Advanced tooth profile, concentricity and accuracy of fit provide maximum power transfer and long-life. Combination of a very high strength base material and an exceptionally hard-wearing surface result in significantly increased chainwheel life. Self cleaning mud grooves help prevent dirt build-up.
_________________________________________________________________________________________________________________________________________________ FITMENT CHART

1995	Honda	XR200R
1984	Honda	XR250R
1984	Honda	XR500R
1987	Honda	XR600R
2007	Yamaha	WR250F
2013	Yamaha	WR250F
2006	Yamaha	WR450F
2012	Yamaha	WR450F
2013	Yamaha	WR450F
2004	Yamaha	YZ125
2009	Yamaha	YZ125
2013	Yamaha	YZ125
2006	Yamaha	YZ250
2013	Yamaha	YZ250
2006	Yamaha	YZ250F
2008	Yamaha	YZ250F
2013	Yamaha	YZ250F
2000	Yamaha	YZ426F
2003	Yamaha	YZ450F
2013	Yamaha	YZ450F