Surely the brifters are where you do most of the changing, so they'll have the most important shifting buttons, and they are definitely braking system specific.
There is no 105 Di2 rim brake. You can get Ultegra and Dura Ace of the same gen (12 speed) in Di2 but it's a bit hobbled (no wireless shifting, last gen brakes etc.). They didn't bother when doing 105. I doubt they will bother on the upcoming 13 speed generation either, at any level.
There is no 105 Di2 rim brake. You can get Ultegra and Dura Ace of the same gen (12 speed) in Di2 but it's a bit hobbled (no wireless shifting, last gen brakes etc.). They didn't bother when doing 105. I doubt they will bother on the upcoming 13 speed generation either, at any level.
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