Shimano Ultegra Di2 STI for TT/Tri Bar - ST-6871R - RightWith Di2 technology shifting is easy and precise just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear. The removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contaminates, corrosion and stretching, and also provides effortless gear shifts. Simply pressing tactile buttons allows effortless and comfortable shifting
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Shimano Ultegra Di2 STI for TT/Tri Bar - ST-6871R - Right