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seat post shims?

ukracerukracer Posts: 421
edited December 2008 in Workshop
Are these ok to use?
Looking to use one to shim my seat post up from 27.2 to 31.6
Both the post and bike frame are carbon and worried my cause problems with flexing etc etc


  • well i've used one for a few years now and never had a problem... but not on a carbon bike.

    should be fine though
  • That's a lot of shimming! I've used a 0.8mm shim (27.2 to 28.0mm) but 4.4mm is an awful lot and I would suggest getting the right diameter post
  • rjsmithrjsmith Posts: 1,924
    Shimming a 27.2mm post into a 31.6mm frame is no problem. Often done to add a little more comfort to an overly stiff frame. Done it on my CR1 for long rides - makes a fair difference.
    Downside is looks - the post can look a bit think compared to the tubing.
  • Monty DogMonty Dog Posts: 20,614
    No problem shimming down from 31.6 to 27.2 - some 31.6 posts can be overly-stiff whereas the 27.2 has more give. Shims are made from acetal (USE) and you'll never have to worry about a sticking post either. I've got a 27.2 FSA post into my Battaglin and from a distance you'd never tell - there's more choice in 27.2 posts as well.
    Make mine an Italian, with Campagnolo on the side..
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