GILERA MJ rear sprocket for Gilera 125 R1 1988-1989 MJ Corse MJ.345 €46.52 High quality duraluminium (ergal) rear sprocket for Gilera 125 R1 1988-1989 with chain pitches and and with number of teeth from 38 to 54. Select the chain pitch and number of teeth you need by clicking below. Add to cart