Ultegra Di2 and 105 Di2 are also electronic, before you move into Shimano's mechanical groupsets. These go from 105, which is 12-speed, all the way down to Claris, which has eight speeds.

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The connection between your feet and the pedals is so critical that if you get it right, you can do more than you ever thought possible. Get it wrong though, and no amount of perseverance will ...