The Shimano Deore M4100 mountain bike Rapid-fire shifter pod featuring 2-way release for cost effective Dyna-Sys 10-speed shifting performance. Light to the touch but positive and crisp, Vivid indexing provides a constant amount of shift lever force across all 10 sprockets.  2-way release allows shifting from various riding positions; the upper lever still performs the same shift function, but it can now swing in either direction allowing it to be released by the thumb or index finger.Dyna-Sys 10-speed compatible - for use with precision 10-speed MTB drivetrainsPod design allows the use of these shifters with any brake leverI-spec-EV design is developed to attach directly to I-spec-EV brake leversBarrel adjuster for fine gear tuningComplete with Optislick inner and SP41 outer cablesEasy access clamp band adjustment for quick set up