Superlight-
I knwo you just got your CAAD 7, and on your spec sheet you had an extralite seat collar. I just got one in the mail today for my CAAD 7 (31.8, the smallest they make) and IT ISN'T EVEN CLOSE TO FITTING! I was told by the people at extralite that the 31.8 would fit and it doesn't, so hopefully you haven't bought one yet. By the way, does anyone wanna buy a 31.8 extralite THE CLAMP?

But my CAAD 7 is 27.2mm is 31.8 external diameter?

yes

I already have one, from my old bike. Why doesn't it fit? Too big or too small? If too big then they sent you the wrong size. I have the 31.8mm and it was able to work on my post diameter of 26.8 a hair big for that but worked, so 27.2 should be perfect.

_________________
MAMA SAID KNOCK YOU OUT! HUH!

well, its way too big, and thats what I thought, that they had sent me the wrong size, so i went to my emails etc. with extralite and every interaction i had with them said 31.8. I haven't looked at it with a caliper or anything, but this thing isn't even close to the right size. I thought that it might be because of how thin the tube walls are, even in the seat tube (other al frames I have had have been MUCH thicker) I'll keep you updated though.

I'm pretty sure they gave you the wrong size, the seat tube where the top clamp is is almost a standard diameter with each seat post size, i.e a 27.2 on one frame is most likely to have the same outer diameter as another frame with that size.

_________________
MAMA SAID KNOCK YOU OUT! HUH!

Maybe you've done this alredy, but why don't you measure the inner diameter of the clamp?

_________________
'Tape was made to wrap your GF's gifts, NOT hold a freakin tire on.'

Follow me on twitter. I try to be interesting
On Facebook!

Just letting you know 520 my extralite clamp fits perfect on my CAAD 7, just got it yesterday. They sent you the 34.9mm diameter. Contact them, they messed up.

_________________
MAMA SAID KNOCK YOU OUT! HUH!