Primary Drive Chain Roller Large 38mm Yamaha YZ250F 2001–2020 Yamaha YZ450F 2003–2017 Primary Drive Chain Rollers are quality replacements for worn and broken stock rollers.  Double sealed precision roller bearings for strength and longevity. Roller made from polyurethane for shock absorbtion and long wear. Also Fits: Honda CR125R 1999–2001 Honda CR250R 1990–1991 Honda CR250R 1997–2004 Honda CRF250X 2004 Honda CRF450R 2004 Honda XR650R 2000–2007 Kawasaki KLX400R 2003 Kawasaki KLX400SR 2003 Suzuki DR-Z 250 2001–2007 Suzuki DR-Z 400 2000–2004 Suzuki DR-Z 400E 2000–2007 Suzuki DR-Z 400S 2000–2007 Suzuki DR-Z 400S 2011–2020 Suzuki DR-Z 400SM 2005–2009 Suzuki DR-Z 400SM 2013–2020 Suzuki DR250S 1990–1995 Suzuki DR350SE 1997–1999 Suzuki RM125 1987–2000 Suzuki RM250 1986–2000 Suzuki RMX250 1989–1998 Suzuki RMZ250 2016–2018 Suzuki RMZ450 2013–2020 Yamaha WR250F 2001–2009 Yamaha WR250F 2011–2013 Yamaha WR250F 2015–2020 Yamaha WR400F 1998–2000 Yamaha WR426F 2001–2002 Yamaha WR450F 2003–2009 Yamaha WR450F 2011–2018 Yamaha YZ125 1987–2000 Yamaha YZ125 2002–2020 Yamaha YZ125X 2020 Yamaha YZ250 1987–2020 Yamaha YZ250FX 2015–2019 Yamaha YZ250X 2016–2020 Yamaha YZ400F 1998–1999 Yamaha YZ426F 2000–2002 Yamaha YZ450FX 2016–2020