Originally Posted by domestique
It actually comes in 3... I own two.
28.6 mm, 31.7 mm, and 35mm.
The 28.6 mm is too tight, and the 31.7 mm is a tad too small as well. The 35mm is too big.
Have you used a thick rubber shim on 35m, that way if you have an out of round seat tube (eg. carbon frame) the edges won't damage it as well.