The ultimate in reliable lightweight shifters from the ultimate Shimano MTB groupset, XTR shifters are engineered to perform in the most demanding conditions Shimano M9100 XTR 11/12 Speed mono Shifter Features Light to the touch but positive and crisp, Vivid indexing provides a constant amount of shift lever force across all 12 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 of shift 2-Way release allows the upper shift lever to perform the same Multi Shift function when pushing with thumb, when activated by pulling the shift lever with the index finger a single release mechanism is actuated Shifter features a precision indexing drum with four sets of ball bearings providing low-friction smooth shifting Long carbon shift levers with rubber inserts help to lower shifting effort and improve grip Composite barrel adjuster For use with 12-speed only