Rear - Front sprockets Front sprocket for Aprilia Rotax (Large Spline) 1987-1988 Marca 1 MJF.178 €16.76 Front sprocket for Aprilia Rotax (Large Spline) 1987-1988, available in pitch 520 and with number of teeth from 13 to 17. Choose the pitch and number of teeth you need below. Add to cart