What do you mean by cross over point? i have rode nothing but the 50-34 with a 12-25 so I probally wouldn't know what you talking about with the crossover point. I'm saying that when things get fast or downhill with the 50-12 I'm flat spinning to fast where now that my knees are in better shape I want to be able to mash harder and spin less. I really don't know why I ask stuff on here because i get the same stupid remarks about money and crap but then you look and see these people rolling around on 10k+ bikes. I'm not my stuff is moderatly priced equipment. I am really confused because I though this is where you come to get answers about racing setups and such.