Think I'd need some kind of NDS step down to 22mm shim. I'd rather take advantage of BB30 if my frame has it though. Even if it takes longer. Still got this weird BB30a thing to get my head around. I don't even know if Red22 cranks can work in it.
I have that adaptor, so many creak-free miles. That said, here is a bit pointless, SRAM gpx is 100gr heavier than BB30, and with the adaptor may be even heavier. Good if you want to run Shimano tough, would recommend.
Last bit now is for some Red 22 BB30 cranks