Renthal Ultralight rear sprockets are designed to stand up to extreme racing conditions. 66% lighter than steel, they are precision-crafted with specially enhanced 7075 T-6 aluminum alloy and CNC-machined for superior strength and long-term durability. Self-cleaning mud grooves between each tooth keep dirt buildup at bay. Proven by more factory race teams, Renthal Ultralight rear sprockets are the obvious choice for your competitive edge. Fits on: HONDA XR250R 1988-1989 YAMAHA WR250F 2001-2009 YAMAHA WR250F 2011-2013 YAMAHA WR250F 2015-2021 YAMAHA WR400F 1999-2000 YAMAHA WR426F 2001-2002 YAMAHA WR450F 2003-2009 YAMAHA WR450F 2011-2021 YAMAHA YZ125 1999- 2022 YAMAHA YZ125 MONSTER ENERGY YAMAHA RACING EDITION 2022 YAMAHA YZ125X 2020-2022 YAMAHA YZ250 1999-2022 YAMAHA YZ250F 2001-2022 YAMAHA YZ250F MONSTER ENERGY YAMAHA RACING EDITION 2021-2022 YAMAHA YZ250FX 2015-2022 YAMAHA YZ250 MONSTER ENERGY YAMAHA RACING EDITION 2022 YAMAHA YZ250X 2016- 2022 YAMAHA YZ400F 1999 YAMAHA YZ426F 2000-2002 YAMAHA YZ450F 2003-2022 YAMAHA YZ450F MONSTER ENERGY YAMAHA RACING EDITION 2021-2022 YAMAHA YZ450FX 2016-2022