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The Shimano Ultegra Di2 Remote TT Shifter replaces your bar end shifters and is e-tube compatible (the technology that will be used in all Shimano electronic shifting from now on) and is meant to be used for Ultegra TT setups (6770) as well as Dura-ace TT setups (9070) and can be used whether you run 10 or 11 speed system. The Di2 TT shifter is a dual-button design for TT/triathlon bikes with double chainrings. It gives you one side with two buttons that control the front derailleur and the other side has two buttons to shift the rear derailleur. 100 grams a pair.