Re: [CR]Internal expander seatposts ??

Example: Framebuilders:Richard Moon

Date: Tue, 20 Apr 2004 09:06:29 -0700 (PDT)
From: David Feldman <>
Subject: Re: [CR]Internal expander seatposts ??
To: Donald Gillies <>,
In-Reply-To: <>

Bridgestone did this on a cheap steel bike ca. 1980, and I believe Vitus or TVT had a clampless frame with an expanding seatpost around 1985.
David Feldman
Vancouver, WA

--- Donald Gillies wrote:

> My modern (1998 TREK 2300) superbike just split its

\r?\n> aluminum seat lug

\r?\n> at the base of one of the lug ears, and the frameset

\r?\n> is ruined. I

\r?\n> have held a funeral and am sending it to that great

\r?\n> crematorium in

\r?\n> wisconsin for recincarnation as a completely

\r?\n> different frameset from

\r?\n> the bike gods at TREK.


\r?\n> This got me thinking about internal expander

\r?\n> seatposts. Jan Heine

\r?\n> tells me that expander seatposts are an "Alex

\r?\n> Singer" exclusive

\r?\n> feature. Is this really true ?? Did any other

\r?\n> maker ever sell

\r?\n> expander seatposts ?? By this I mean a seatpost

\r?\n> that operates upon

\r?\n> the same principles as a quill stem.


\r?\n> Alas, my bike was 3 tubes carbon and so an expander

\r?\n> would probably

\r?\n> split open the carbon tubes and would therefore not

\r?\n> solve my problem.


\r?\n> - Don Gillies

\r?\n> San Diego, CA