RIEJU MJ rear sprocket for Rieju Naked 50 2004-2009 MJ Corse MJ.459 €45.50 High quality duraluminium (ergal) rear sprocket for Rieju Naked 50 2004-2009 with chain pitch 420 and with number of teeth from 45 to 50. Select the chain pitch and number of teeth you need by clicking below. Add to cart