I am thinking about it, cuz we were in the mountains, and there was a lot of stuff I couldn't get up in my 34, remembering that we are on dirt, not paved roads, with a bike that weighs 30 lb (and someday I may add groceries, etc. to that). But I could also get a 24 bottom too. I notice a 24/38 is standard in XTR, so perhaps that shifts better. I assumed I could have a 16 tooth gap since that is what I have on my road bike (50/34). I picked 22 cuz that was the lowest gear on the original triple that came on the bike.