What is the spindle diameter on the FSA Gossamer TT MegaExo crankset? 24 mm or 30 mm? I can't find a direct answer anywhere. I have seen MegaExo described as 19 or 24 mm, but "Gossamer" as 30. I'm looking at the aforementioned crankset for my Giant Trinity BB90 bottom bracket shell, but I don't want to go 30 mm.
I believe Gossamer is more of a ‘level’ of FSA products rather than a particular crank model.
MegaExo is an FSS external bearing bottom bracket type for BSA threaded shells. It uses a 24mm spindle diameter.
According to this article 24mm spindle external bearing road cranks are compatible with BB90.