If I wanted to downsize the 42T on my 9s triple to a 40T, am I forced to buy the Campy-branded ones? (Or TA, for that matter.) Salsa offers a 40T with a 135mm bolt pattern, but of course I need to be 110% sure it'll fit before I go ordering one. http://www.salsacycles.com/chainrings.html
Also, hypothetical question... say I wanted to also swap the 30T to a 26T. The Holy Guru says it's OK, as long as you don't crosschain. Is it OK to put a 26T (either Salsa or TA, they both offer that size in a 74mm) with the non-Campy 40T middle ring?
I know this may seem really obvious to some, but I just want to make sure. And no making fun of me for needing a 26T.