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

1997	Honda	CR250
1992	Honda	CR250R
1999	Honda	CR250R
2007	Honda	CRF150F
2013	Honda	CRF150F
2013	Honda	CRF230F
2013	Honda	CRF250R
2007	Honda	CRF250X
2013	Honda	CRF250X
2006	Honda	CRF450R
2013	Honda	CRF450R
2005	Honda	CRF450X
2008	Honda	CRF450X
2013	Honda	CRF450X
1999	Honda	XR250R
2000	Honda	XR250R
2004	Honda	XR250R
1997	Honda	XR400R
2000	Honda	XR650R
2004	Honda	XR650R