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The Shimano XTR FIREBOLT Di2 Shifter provides seamless control and instant response. The new, easy-to-use XTR Di2 FIREBOLT shifter makes shifting a simple rider reflex and deliver's customizable ergonomics that improve bike control. Shimano's FIREBOLT customizable shift button placement is determined entirely by human ergonomics, not by the needs of a mechanical mechanism. FIREBOLT shift levers are now exactly where thumbs naturally rest, allowing riders to put more grip on the handlebar and control the ride with more confidence, especially in rough conditions.