Re: [CR]Re: 27.4 Posts > Now: Reynolds 531 Professional tubes only 27.4?

(Example: Framebuilders:Brian Baylis)

Date: Sat, 13 Nov 2004 09:01:30 -0600
To: FujiFish1@aol.com
From: "Mark Stonich" <mark@bikesmithdesign.com>
Subject: Re: [CR]Re: 27.4 Posts > Now: Reynolds 531 Professional tubes only 27.4?
In-Reply-To: <1b9.678ad2f.2ec755cd@aol.com>
cc: classicrendezvous@bikelist.org

At 11/13/2004 07:19 AM -0500, FujiFish1@aol.com wrote:
>>Trek spec'd a Super Record 27.4 post on their Reynolds 753R frames. 753R
>>seat tubes were very thin and came with 27.4 ID. IIRC the 531
>>"Professional" lightweight set also used 27.4mm.
>>-John Thompson (john@os2.dhs.org)
>> Appleton WI USA
>
>
>I'm not sure that Reynolds 531 Pro tubing uses only 27.4, as I have a
>Austro-Daimler Ultima SL (Superlight) frameset in the basement with this
>tubing, and
>I believe it takes a 27.2 post ('cause I never did have a 27.4 post here
>in my
>"shop"). I can confirm that if anyone is interested, but I thought I'd add
>this in.
>
>Ciao,
>Mark Agree
>Southfield MI

Even "Standard" 531 seat tubes would accept a 27.4 post before brazing. Brazing, even with silver, would always shrink the ID somewhat. A really skilled builder like Chris Kvale would often get so little shrinkage that a 27.2 wouldn't work, so he always kept 27.4 posts on hand.

Mark Stonich;
Minneapolis Minnesota
BikeSmith Design & Fabrication LLC
http://bikesmithdesign.com