All the full aero ones I have are sized to fit the true temper aero tubing, roughly 1 1/8 long axis by 3/4 short axis. There may have been one to fit Columbus "air" tubing, which was thinner on the short axis, but I've never seen one. I'm not sure at all if one would have been made for Reynolds speedstream, and I don't have a speedstream bike to check the profile.
At any rate, the question was well timed, as I needed a dura ace AX post, and had an easy solution (I bought it)
Steve Birmingham Lowell, Ma
From: Peter Naiman <hetchinspete1@yahoo.com> Subject: [CR]Question about Dura Ace AX seat post sizing. Message: 5
I've listed a Dura Ace AX seat post, the aero shaped one om Ebay and have recieved atleast four requests for size information. The post has no size engraved on it, and I had always assumed that these were all one standard size. Anyone have an answer ?
Peter Naiman
Glendale, WI