The shimano xtr m9000 rapid fire shifters is where shimano has set the benchmark with the next generation of mountain bike shifting m9000 xtr rapidfires with vivid indexing are their slickest shifters yet they are light to the touch but positive and crisp vivid indexing provides a constant amount of shift lever force across all sprockets the instant release for super fast shifts delivers the chain to the next gear the moment the lever is actuated with no hesitation the 2 way release allows