I (gasp) have an FSA with MegaExo BB. The Campy purists will need to chime in here, but I believe Campy did the same thing and just machined the rings closer together. Remember, the only thing that has changed with the "narrower" chains is the outside. The inner dimensions have stayed the same.Fignon's Barber said:so the campy 9 speed rings should work with their 10 speed chains? After reading on the campy site that they weren't compatible, I didn't try it.