Shimano sets the benchmark with the next generation of mountain bike shifting dyna sys 10 speed xtr rapidfires with vivid indexing light to the touch but positive and crisp vivid indexing provides a constant amount of shift lever force across all 10 sprockets instant release for super fast shifts delivering the chain to the next gear the moment the lever is actuated with no hesitation multi release allows multiple gear changes from both levers with one sweep further adding to the speed