Rear sprockets MJ rear sprocket for Muz Trouper 660 97-98 MJ Corse MJ.285 €39.62 High quality duraluminium (ergal) rear sprocket for Muz Trouper 660 97-98 with chain pitches and and with number of teeth from 39 to 47. Select the chain pitch and number of teeth you need by clicking below. Add to cart