Originally Posted by
shovelhd
Not on the same wheel. SRAM and Shimano share the same 11 speed freehub. Campy uses a different 11 speed freehub. The spacing of all three is within a fraction of a mm so in that sense they are interchangeable. In summary, the way I understand it:
Shimano/SRAM 11 speed freehub - Shimano or SRAM 11 speed cassette
Campy 11 speed freehub - Campy 11 speed cassette
Any of the above combinations will work with any of the respective drivetrains, i.e. -
Shimano or SRAM 11 speed drivetrain - Shimano/SRAM freehub and cassette or Campy freehub with Campy cassette
Campy 11 speed drivetrain - Campy freehub with Campy cassette or Shimano/SRAM freehub and cassette
FWIW, i've run shimano, sram, and campy 11 on the same zipp wheel without any derailleur adjustment. i swapped the free hub over from a shimano/sram to campy one, of course. pretty cool. a very slight derailleur tweak made it perfect, but a spare wheel from any would work (e.g., if you got a spare in a race).