Anyone know what size front derailleur clamp the f1x and i'm assuming most felts use? Thanks.

31.8 according to the website:

http://www.feltracing.com/08/product.asp?catid=1504,1513&pid=8719

Yep, 31.8. Just looked at the FD that I took off my F1X and that was the size.

cool. for some reason i couldn't find it on the site. i'm a little retarded with the intarweb sometimes.