Just FWIW, on some frames it is not the same as the Front mech clamp, which surprised me when I found this out. This can be due to the fact of butted or tapered tubing on a frame.f*nætik said:You'll probably need a 35mm clamp, but it's best to measure. In most cases it's the same clamp diameter as your front derailleur.
I use a 31.6 Tune seatpost and my Extralite clamp size is 34.9mm both are for sale btwAMcK said:What size clamp is used with a frame that has a 31.6 post.