Re: [CR]French seatpost sizes, you learn something everyday!

(Example: Framebuilders:Dario Pegoretti)

From: "scott davis" <francopedia@yahoo.com>
Subject: Re: [CR]French seatpost sizes, you learn something everyday!
To: classicrendezvous@bikelist.org
In-Reply-To: <15d.17857f52.2b06bdc4@cs.com>
Date: Fri, 15 Nov 2002 13:41:19 -0800 (PST)

I have a mid-70s 753 Lejeune, which came w/ a pantographed 27.0 "Lejeune" seatpost, which fits w/ the metric sizing. Scott on the right bank of the Mississippi in St. Paul, MN


--- GPVB1@cs.com wrote:


> Hi Grant:
>
> That makes sense.
>
> 26.6 is a fairly typical (Metric) 531 seatpost
> diameter for French, etc.
> frames. 753 (which was only produced in Metric
> diameters in its original
> incarnation IIRC), being very thin-walled, usually
> (but not always,
> apparently - seatposts can vary in actual O.D.)
> required a 26.8 or 27.0 post,
> as opposed to the then-standard 27.2 for "standard
> gauge"
> Imperial-dimensioned 531 (i.e. the thinner wall but
> smaller O.D. of Metric
> 753 equals almost the same post diameter as Imperial
> 531...).
>
> The Raleigh Team Pro frameset literature, for
> example, mentioned 27.0, but my
> personal frame came with a hand-written tag "to suit
> 26.8 seat pillar." I'm
> guessing they used slightly thicker walled tubing
> due to the size (60cm)....
>
> At Raleigh Midwest in about 1979, we used to get
> "time trial 753" framesets
> from Ilkeston for Michael Fatka's team - now those
> we had to tie weights to
> so they wouldn't float away! Advertised mid-sized
> weight was 4.75 pounds
> frame/fork/headset, whereas the "regular" 753 ones
> were advertised as 5.5
> pounds....
>
> Cheers,
>
> Greg "thin-walled" Parker
> A2 MI USA
>
> Grant McLean wrote:
>
>
> > Just yesterday, I was looking at these pictures of
> Bernard Hinault's TDF
> > bike from early 80's , and was puzzled by the 26.6
> seatpost size in the
> > Reynolds 753 frame... Then today, Hilary's sale
> list included: "CAMPAGNOLO
> > RECORD 26.6mm SEATPIN NOS - for many frames with
> double butted French
> > dimensioned tubing."
> >
> > Never dawned on me that this was a French
> dimension too, I figured Reynolds
> > tubing= 27.2 or maybe 27.0 I suppose if 22.0 is
> good enough for the stem,
> > why not 26.6 for the post!
> >
> > Grant McLean
> > Toronto, 2 Languages, Canada
> >
>
>
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