Quote Originally Posted by parity View Post
50-11 is lower the 53-12. An 50x34 with a 11x23 is about the same is a 53x39 with a 12x25. You can check it out on Sheldon Brown's web site.

http://sheldonbrown.com/gears/

Right, but I was expecting and wanted 53-11. Right now I have 50-12. I've already ordered the 11X27, but need to get the 53X39.