Our article about cassettes has been updated to include information on 11-speed systems. Interesting — all major brands of 11-speed casettes now have the same sprocket spacing. Most rear derailers and shifters are not compatible, though. We can tell you which ones are.
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Hello,
I am trying to put campy Athena groupset on my specialized bike which had Shimano tiagra groupset on it. What will I have to do for do to make the free hub compatible for an 11 speed campy cassette? Is there a way to make it work with the Shimano free hub or do I have to purchase a new free hub?
The spline patterns of Campagnolo and Shimano hubs are not compatible, so you can’t interchange cassettes. However, the sprocket spacing is the same for Shimano, SRAM and Campagnolo 11-speeds, so you can use a derailer and shifter of one brand with a hub and cassette of the other. See https://fitwerx.com/campagnolo-shimano-and-sram-11-speed-wheel-compatiblity/.