I'm looking to build a fun bike for casual coffee runs and commuting when the weather is nice. I love the look of old TT or pursuit bikes that have bull horns and am looking to use bull horns and tt base bar dual control levers. If I use a ultegra Di2 6871 lever do I need the other lever or will it work on its own? Do I need to have the extension shifters too for the system to work or no?
Discuss light weight issues concerning road bikes & parts.
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