Advantages/Disadvantages to a shimmed seatpost



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Paul

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The seatpost on my bike is a 26.6mm shimmed into a 30.2 seat tube, this is just how the manufacturer
set it up.

When removing the post and shim recently for adjustments I noticed that the shim had scraped a tiny
sliver of aluminium of the inside of the tube as pulled it out, nothing to worry about I'm sure but
it led me to wondering whether there are any advantages/disadvantages to having shimmed posts.

My current post is looking a bit battered so I may replace it, would I be better going for a 30.2
post and discarding the shim or sticking with a shimmed post?

Does the shim place any additional wear or stress on the seat tube or does it offer some protection.
Presumably a shimmed post is less likely to sieze but then again I guess that a thicker seatpost is
likely to be stronger.

Are there any advantages/disadvantages to this setup or does it make no difference whatsoever? Just
curious really.

Thanks for any thoughts, Paul.
 
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