APRILIA MJ rear sprocket for Aprilia 50 RX Factory E4 2T LC 2018-2020 MJ Corse MJ.402 €44.46 High quality duraluminium (ergal) rear sprocket for Aprilia 50 RX Factory E4 2T LC 18-20 with chain pitch 420 and with number of teeth from 46 to 54. Select the chain pitch and number of teeth you need by clicking below. Add to cart