Let me add to that: 27,2 for 753 OS. OT of course.
Freek Faro Rotterdam Netherlands
-----Oorspronkelijk bericht----- Van: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org] Namens Mick Butler Verzonden: vrijdag 1 juli 2005 19:27 Aan: classicrendezvous@bikelist.org Onderwerp: RE: [CR] 753 vs 531 Seat pin sizes
Thisi is what I have for reynolds seat post sizes 753 = 27.4 753AT = 27.4 753 Tandem = 27.2 Most 531 including tandem tubing 27.2
Michael Butler Huntingdon UK.
>From: "Bingham, Wayne" <WBINGHAM@imf.org>
>To: <classicrendezvous@bikelist.org>
>Subject: RE: [CR] 753 vs 531
>Date: Fri, 1 Jul 2005 13:18:04 -0400
>
>Greg Parker wrote:
> >>>2) Seat post diameter - 753 tubing came in Metric diameters only,
>AFAIK, so the seat posts required were generally 26.8 mm (sometimes
>27.0) vs. 27.2 mm for 531. (Athough very heavy-gauge 531 frames
>sometimes used 26.8 posts, but the weight difference would be even
>greater for one of those vs. 753)<<<
>
>I have three frames built with 753 tubing; '89 Merckx Grand Prix, '85
>Raleigh Team USA, and '84 custom Trek track frame. Only the Raleigh
>sports a 753R sticker. Both the Raleigh and the Trek are currently
>built up with Campy components, the Merckx is not built up, but was my
>primary ride for many years (and many miles), and I used a Cd'A post.
>All are currently in storage due to my shop construction project, so I
>can't go do an in-depth analysis, but I'm pretty confident that all use
>27.2 seat posts.
>
>How does that fit into the 753 puzzle?
>
>Wayne Bingham
>Lovettsville VA