Shimano alivio m4000 9 speed trigger shifteralivio mtb dedicated mountain biking components control with confidence proven race technology with larger clearances improved ergonomics and a visible optical gear display to confirm the gear position at a glance featuresshift lever type rapidfire plusfront shifting 3features 2 way release optical gear display compatable with v brake levers a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace