APRILIA MJ rear sprocket for Aprilia SX E4 2T 50 MJ Corse MJ.222 €42.39 High quality duraluminium (ergal) rear sprocket for Aprilia SX E4 2T 50, with chain pitches 415 and 420 and with number of teeth from 38 to 65. Select the chain pitch and number of teeth you need by clicking below. Add to cart