Shimano alivio m4000 v brake 9sp shifter setthe m4000 brake leversshifters are an integrated unit which takes up less handlebar space ideal for commuting touring and off road cycling they are crisp and light to shift whilst providing reliable braking power the added benefit of 2 way release on the upward shift lever means you can shift traditionally with your thumb or with your index finger which many find more comfortable features shift lever typerapidfire plus cassette compatibili