Shimano M6100 Deore 12 Speed Rear ShifterThis rear shifter is designed for MTB riding, as it gives you sharp shifting performance on the trails. It features 2-way release technology, which allows shifting from various riding positions. This means that the upper lever still performs the same shift function, but it can also swing in either direction allowing it to be released by your thumb or index finger. Shimano has also equipped it with a number of adjustment features for a more rider-tuned feel.Features: Use: MTB Speed: 12 speedRelease: 2-way releaseIndexing: Vivid indexingDyna-Sys Compatible: Yes - for use with precision 12-speed MTB drivetrainsAdjustment: Multi-position adjustable handlebar clamp, barrel adjuster Includes: Optislick inner and SP41 outer cablesSingle or Pair: SingleMount: Band On or I-Spec EV options available separately Part Numbers: Band On Right No Display: SLM6100R; Band On Right With Display: SLM6100RD; Black I-Spec EV Right With Display: SLM6100IRD; Black I-Spec EV Right No Display: SLM6100IRTechnologies: 2-way Release: 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.Vivid Indexing: Light to the touch but positive and crisp, Vivid indexing provides a constant amount of shift lever force across all 12 sprockets.A 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.