Shimano XTR M980 10 Speed Right Hand Shifter I Spec B: The Shimano XTR M980 I Spec B Rapidfire shifter sets the benchmark of mountain bike shifting. With Multi Release allowing multiple gear changes from both levers with one sweep & 2-Way release for the upper shift lever. This XTR shifter feature Instant Release for super fast shifts, delivering the chain to the next gear the moment the lever is actuated with no hesitation also the Multi Release function allows multiple gear changes from both levers with one sweep, further adding to the speed of shift. The 2-Way release allows the upper shift lever to performs the same Multi Shift function but swings in either direction allowing it to be released by the thumb or index finger Light to the touch but positive & crisp, Vivid indexing provides a constant amount of shift lever force across all 10 sprockets I-spec-B design is developed to attach directly to I-spec-B brake levers Horizontally adjustable forged alloy I-spec mount allows the shifter to be moved in or outboard of the brake lever Instant Release for super fast shifts with no hesitation Multi Release allows multiple gear changes from both levers with one sweep 2-Way release Multi shift upper lever Shifter features a precision indexing drum with four sets of ball bearings providing low-friction smooth shifting One piece anodised alloy release levers increase durability Composite barrel adjuster For use with Dyna-Sys 10-speed only Weight 102 grams