Aprilia RS4 125 standard transmission kit

14-tooth sprocket, 40-tooth steel crown and 520 pitch reinforced chains without seals, 104 links and Clip closure

15-tooth sprocket, 42-tooth steel crown and chain with 520 pitch gold X-ring retainers, 110 links and rivet closure

15-tooth sprocket, 44-tooth steel crown and chains with 520 pitch gold X-ring retainers, 110 links and rivet closure

16-tooth sprocket, 42-tooth steel crown and standard 428 pitch chains without retainers, 118 links and clip closure

17-tooth sprocket, 40-tooth steel crown and 520 pitch black X-ring chains with retainers, 110 links and clip closure