Manufactured by Factory Spec Rear Sprocket for Honda ATV 39 tooth, rear steel Sprocket 520 pitch Made in China Sprocket may not be the stock size for all of the models it fits. When changing sprocket sizes, you might also need to change your chain length Fits the following 1999 Honda TRX400EX Sportrax 2000 Honda TRX400EX Sportrax 2001 Honda TRX400EX Sportrax 2002 Honda TRX400EX Sportrax 2003 Honda TRX400EX Sportrax 2004 Honda TRX400EX Sportrax 2005 Honda TRX400EX Sportrax 2006 Honda TRX400EX Sportrax 2007 Honda TRX400EX Sportrax 2008 Honda TRX400EX Sportrax 2009 Honda TRX400X Sportrax 2012 Honda TRX400X Sportrax 2013 Honda TRX400X Sportrax 2014 Honda TRX400X Sportrax ***Stock gearing for 1999-2004 models is 15/38 and 2005-2014 models is 14/39***