Well, that's good news. Maybe I'll be a guinea pig and try the 46T. I'd like to get a low of 26T, which would allow me to push the rear to 30T (using an Mk II RD, as well, which I've read others have pushed to 37T chain wrap capacity). Actually, I'd rather have a high of 50 and a low of 26, but that probably won't work. I might try a 50T high and 28T low (to really push it), and something intermediate, like a 40 in the middle.