Renthal Rear Wheel Sprocket Black 52T with Keepitroostin Sticker Fits Yamaha Yz250f Yz450 2001-2014 Fits Yamaha Yz250f Yz450 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Renthal Ultralight rear chainwheels are manufactured to exteremly tight tolerences from a special material developed to withstand the rigours of Supercross, Motocross and Enduro. The 7075 T6 aluminium alloy rear chainwheels are 66% lighter than steel, yet incredibly durable. Their advanced tooth profile, concentricity and accuracy of fit provide maximum power transfer and long-life. Includes Keepitroostin Sticker Renthals combination of a very high strength base material and an exceptionally hardwearing surface result in significantly increased chainwheel life