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PostPosted: Thu Apr 11, 2013 11:26 am 
Windmilling for a Scotch Egg
Windmilling for a Scotch Egg
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Joined: Tue Feb 15, 2011 10:27 am
Posts: 4840
Location: Huddersfield, West Yorkshire
I am sure I've done this before with no problems but I thought I'd check.

I have a USE suspension seatpost in the 25.0 size I want to put on my wife's bike which has a 27.2 seat tube.

So I need a shim BUT USE didn't make one as they make a 27.2 post so who would shim a 25.0 post when they could just use the right size in the first place?

I can't find anyone else who is selling a 25-27.2 shim either.

But (and I think this is what I've done before) all I need to do is bridge a 2.2mm diameter difference. So I could buy a 27.2 to 29.4 shim, the same 2.2mm difference, and that would work fine. Admittedly I may need to trim the shim a little where the gap in it is as the metal when sprung in a bit to fit the smaller seat tube might overlap or be too small. But that shouldn't be hard.

Does this all make sense? I am right, aren't I?


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PostPosted: Thu Apr 11, 2013 11:44 am 
MacRetro rider
MacRetro rider

Joined: Fri Feb 09, 2007 4:16 pm
Posts: 8658
Should work as long as you cut out a wider strip from the gap in the shim, possibly you might need to remove or cut in several places the lip at the top of the shim that prevents it dropping down the seat tube as this might impede the curving of the shim around a tighter curvature.


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PostPosted: Thu Apr 11, 2013 11:48 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Mon Apr 05, 2010 8:38 am
Posts: 2679
Location: Norfolkshire
Wow you got me confused there Rob, but its all clearer now ;) Hasnt there been cases where the Seat tube is wider at the top and narrow further down, so shimming means that the narrower seat post still fits in the seattube whilst still being secure by the shim and clamp? If you follow?

I try an avoid shimming, it was always my thought that more surface area touching resulted in stonger fitment of said post? and not just 1 1/2" holding the post secure.

I'm sure there is a technical reason for shimming, other than to open up a greater selection of seatposts to use.

Jussa :)


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PostPosted: Thu Apr 11, 2013 11:52 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Mon Apr 05, 2010 8:38 am
Posts: 2679
Location: Norfolkshire
CRC do one;

http://www.chainreactioncycles.com/Mode ... elID=43709

Jussa :)


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PostPosted: Thu Apr 11, 2013 12:16 pm 
Windmilling for a Scotch Egg
Windmilling for a Scotch Egg
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Joined: Tue Feb 15, 2011 10:27 am
Posts: 4840
Location: Huddersfield, West Yorkshire
Jussa wrote:


:facepalm: :facepalm: :facepalm: :lol: :lol:

I tried to make sure I checked EVERYWHERE before asking this question, I did check CRC, honest guv!!!

Thanks very much - ordered!!!


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