GAS GAS MJ rear sprocket for Gas Gas TXT GP 2013-2021 MJ Corse MJ.429 €35.19 High quality duraluminium (ergal) rear sprocket for Gas Gas TXT GP 2013-2021 with chain pitch 520 and with number of teeth from 30 to 50. Select the chain pitch and number of teeth you need by clicking below. Add to cart