Shimano alivio 9sp drivetrain groupset buildersilent slimsmooth durablecleanfeatures silent allows you to concentrate on riding feel nature without disturbances slimsmooth easy to control easy shifting and braking operation durableclean high durability products which will last for a long timedont settle for almost perfect use our groupset builder to create your preferred mix of ratios and sizes a 2 year warranty is offered with all shimano products from chain reaction cycles