Can anybody tell me why is not advisable to use a shim to convert a 31.6mm seatpost to a 32.4mm? -

Can anybody tell me why is not advisable to use a shim to convert a 31.6mm seatpost to a 32.4mm?

Last post 07-02-2009 4:07 PM by Matthew. 5 replies.

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07-01-2009 2:39 PM

accunique1
Joined on 06-27-2009
Posts 26

Can anybody tell me why is not advisable to use a shim to convert a 31.6mm seatpost to a 32.4mm?

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I read on one of the forum postings that it was not advisable to convert a 31.6mm carbon seatpost to a 32.4mm using a shim. Why? Is it more advisable to convert a 27.2mm to a 32.4mm? Why is it that I can only find shims to convert from a 27.2mm to a 32.4mm but no shims for 31.6mm to 32.4mm?

Please help!

Oscar Pena
R3 2007
Sram Red
Zipp 404

07-01-2009 3:13 PM In reply to

Joe Nation
Joined on 07-23-2008
Posts 195

Re: Can anybody tell me why is not advisable to use a shim to convert a 31.6mm seatpost to a 32.4mm?

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I personally wouldn't ever use a shim, but Bianchi and Giant both sell bikes with them (Bianchis are carbon, so no problem there). Only reason I can see for you not finding a 31.6-32.4 shim is because it's not a common size (I guess?).

RS with Rival, 3T, Reynolds wheels

07-01-2009 3:22 PM In reply to

accunique1
Joined on 06-27-2009
Posts 26

Re: Can anybody tell me why is not advisable to use a shim to convert a 31.6mm seatpost to a 32.4mm?

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Well I already got my new '09 FSA K Force seatpost (31.6mm) which I love by the way and it goes so well with my 2007 R3. But I can see you are right, 32.4mm seat post are not common at all...Thank you for your answer.

Oscar Pena

07-01-2009 6:00 PM In reply to

Marco Hero
Joined on 03-06-2009
Posts 128

Re: Can anybody tell me why is not advisable to use a shim to convert a 31.6mm seatpost to a 32.4mm?

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USE manufacture a 31.6mm inner 32.4mm outer shim: http://www.use1.com/products/seat_post_shims/index.php

You can search for dealers from their site.

07-02-2009 3:32 PM In reply to

accunique1
Joined on 06-27-2009
Posts 26

Re: Can anybody tell me why is not advisable to use a shim to convert a 31.6mm seatpost to a 32.4mm?

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That it's it... Thank you so much... Oscar Pena

07-02-2009 4:07 PM In reply to

Matthew
Joined on 03-07-2008
London
Posts 23

Re: Can anybody tell me why is not advisable to use a shim to convert a 31.6mm seatpost to a 32.4mm?

Reply Contact

accunique1:
That it's it... Thank you so much... Oscar Pena

And here is one available from Wiggle - http://www.wiggle.co.uk/p/cycle/7/USE_316_Internal_Shim/5360041589/ -they ship world-wide and are not too un-competitive on price.

Hope it works out well where-ever you end up getting one from.

Yours,

Matthew

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