This seems like a long shot because I don't know if anyone will be wanting to change crank length and teeth, but I have a Gossamer MegaExo 53/39 that came on my Felt B16. I want a 50/34 crank with a 172.5 crank length.

I might be willing to sell it though if anyone is interested. Really like new, I think there is a total of 100 miles on it.