27.2 seatpost in a 27.4 ti seat tube

[Lawrence Kriese]

I have broken my seatpost and can only find a 27.2 post (noone seems to make odd size posts
anymore). I need to either shim the post or put up with the difference. Who makes shims for posts or
what will make a nice looking shim? Does it matter? Thanks in advance.

Lawrence Kriese

-please e-mail me as well as posting since I rarely get to the computer

 

[John Forrest To]

"Lawrence Kriese" <[email protected]> wrote in message
news:[email protected]...
> I have broken my seatpost and can only find a 27.2 post (noone seems to make odd size posts
> anymore).

American Classic does.

JT

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*******************************************
NB: reply-to address is munged

Visit http://www.jt10000.com
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[Phil Brown]

> have broken my seatpost and can only find a 27.2 post (noone seems to make odd size posts
> anymore).

Pretty common. If you don't want to order one (Thompson, American Classic, many others) at your LBS
find a Waterford dealer-many of their frames use 27.4 posts. Phil Brown

 

[Tom Paterson]

>From: [email protected] (Lawrence Kriese)

>can only find a 27.2 post (noone seems to make odd size posts anymore).

Here's a Kalloy 27.4, found with a "27.4" search of ebay (IOW, I don't know nuttin' about this
seller). Opening bid is< $10.00:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3611914906&category=36139

I've seen Campy N Record in 27.4 offered there, also. Happy hunting. --Tom Paterson

 

[David E. Belche]

[email protected] (Lawrence Kriese) wrote in message
news:<[email protected]>...
> I have broken my seatpost and can only find a 27.2 post (noone seems to make odd size posts
> anymore). I need to either shim the post or put up with the difference. Who makes shims for posts
> or what will make a nice looking shim? Does it matter? Thanks in advance.
>

USE make a wide variety of shims, since their policy seems to be to make only one diameter of post
and provide appropriate shims to keep all buyers happy.

David E. Belcher

Dept. of Chemistry, University of York

 

[Qui Si Parla Ca]

ikreise-<< I have broken my seatpost and can only find a 27.2 post (noone seems to make odd size
posts anymore).

It does matter and Thompson, American Classic and others make a 27.4mm seatpost

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene"

 

[Paul Southworth]

In article <[email protected]>, David E. Belcher
<[email protected]> wrote:
>[email protected] (Lawrence Kriese) wrote in message
>news:<[email protected]>...
>> I have broken my seatpost and can only find a 27.2 post (noone seems to make odd size posts
>> anymore). I need to either shim the post or put up with the difference. Who makes shims for posts
>> or what will make a nice looking shim? Does it matter? Thanks in advance.
>>
>
>USE make a wide variety of shims, since their policy seems to be to make only one diameter of post
>and provide appropriate shims to keep all buyers happy.

A .1mm shim? Impressive.

 

[Paul Southworth]

In article <[email protected]>, Jasper Janssen <[email protected]> wrote:
>On Fri, 13 Jun 2003 15:40:37 GMT, [email protected] (Paul Southworth) wrote:
>
>>A .1mm shim? Impressive.
>
>People make metal foil measured in microns to a reasonable degree of accuracy. What's impressive is
>handling the thing so it doesn't collapse during installation.

That's the rub isn't it? The foil will not fare well when rammed down the seat tube.

>(and, I like the idea of using plastic film -- mylar -- for these sorts of thicknesses)

Perhaps either film or foil could be adhered to the seat post to prevent tearing it.

--Paul

 

[Ken]

"Bald Headed John Kane" <[email protected]> wrote in message
news:<[email protected]>...
> On Thu, 12 Jun 2003 18:34:11 -0700, Lawrence Kriese wrote:
>
> In a pinch I have used shims cut from aluminum soft drink cans....

I've used coke cans before. It didn't last very long before the metal wore thin and the seatpost
came loose.

Kenny Lee

 

[Sergio Servadio]

On Fri, 13 Jun 2003, Paul Southworth wrote:
> A .1mm shim? Impressive.

... and about impossible to install. Polish the post stem down to a bit
smaller diameter and use a conveniently thicker shim.

Sergio Pisa

 

[Anonymous]

>I have broken my seatpost and can only find a 27.2 post (noone seems to make odd size posts
>anymore). I need to either shim the post or put up with the difference. Who makes shims for posts
>or what will make a nice looking shim? Does it matter? Thanks in advance.

I use a 27.0 Al post in a 27.2 Al tube with an Al beverage can as a shim. The shim's length
determines the snugness. I need go about 95% around the circumference to get the proper snugness,
which is good anyway since it gives a uniform bearing surface. I've been riding this a long time
(1000's of miles) with no problems, either slippage or removal.

I don't understand why the shim would wear thin as another poster mentioned, since there is no
movement to cause wear. What am I missing? Even if, who cares really. A 27.2 post is a long term
investment, a 27.4 who knows. Beverage can shims are free and take all of 2 minutes to cut and fit.
A proactive replacement schedule should satisfy if needed.

Doug

 

[Jasper Janssen]

>I don't understand why the shim would wear thin as another poster mentioned, since there is no
>movement to cause wear. What am I missing? Even if, who cares really. A 27.2 post is a long term
>investment, a 27.4 who knows. Beverage can shims are free and take all of 2 minutes to cut and fit.
>A proactive replacement schedule should satisfy if needed.

Also, the failure mode is distinctly non-fatal -- seatpost sliding down a bit, or even completely,
is not that big a deal.

Jasper