YAMASAKI MJ rear sprocket for YAMASAKI HYPERSPORT 50 4T 2013-2018 MJ Corse MJ.488 €51.51 High quality duraluminium (ergal) rear sprocket for YAMASAKI HYPERSPORT 50 4T 2013-2018 , with chain pitch 428 and with number of teeth from 38 to 50. Select the chain pitch and number of teeth you need by clicking below. Add to cart