That will depend on your rear cassette also. For instance, on my road bike, I have a 39/54 front, but I have a (9 speed) 12-27 rear so it offers me plent of gears. On my cross bike I have a 36/46 upfront and a (10 speed) 12-27 in the back. So if you think a 39 upfront is too big, is that with a 23,25 or 27 rear gear? It is much easier to change rear cassette than your chainrings.




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