If I want to put compact cranks onto the Ultegra Di2 for the Alpine Classic Extreme, do I have to get a whole new crankset or can I just change the chain rings? Does it matter that it's Di2 (other than I have to retune it)? It's a 6700.
Or could I just swap it off my other road bike which is also Ultegra 6700 and has compacts?
Compacts advice please
CT chainrings runs a different spacing for its bolts, so you'll need a CT specific crankset. Don't forget the chain length may need adjustment too.
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