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Seatpost Shims

Discussion in 'The Shop' started by berkshire_rider, Oct 27, 2004.

  1. berkshire_rider

    berkshire_rider Growler

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    I want to add a Thomson seatpost to my bike, but it's got a non-standard 30.4 size. Anyone have experience using seatpost shims? Thomson doesn't make a 30.4 (according to their website), but Cane Creek (pic attached) makes a shim that will convert a 27.2 to a 30.4 Will it work OK or should I try and find another brand in 30.4? :confused:
     

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  2. chicodude

    chicodude The Spooninator

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    I've got a shim in for my post.......works fine. Only thong is that the QR has to be tightend a little more.........
     
  3. Jeff 151

    Jeff 151 Monkey

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    Thomson's got posts in more sizes than just about anyone. And certainly THE most of all the high-end seat sticks. A $20 Kalloy is the only 30.4 I'm aware of. Using a shim is just fine. Make sure to line up the shim crack with the slot in the frame. The alternative is to use a 30.0 Thomson or the next smaller one, with a sliver of beer can making up the difference. What kinda frame is that anyway?
     
  4. berkshire_rider

    berkshire_rider Growler

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    It's a Craftworks FRM125. It came with a black Ritchey seatpost, but it seems to work it's way lower while riding. :think:
     
  5. dorfonbikes

    dorfonbikes Chimp

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    I'm running that exact same setup on my bike and it's working great. I was never a big fan of shims, but the thomson was a flat out winner between my choices. which were either identiti, or raceface. I'm running a 27.2 thomson(for future compatability) and a cane creek 30.4 shim on my identiti dr. jekyll. i've been running it for 5 months now and no slipping, creaking, or problems. i wish i could've used one of the two 30.9 thomsons i had sitting around :)
     
  6. berkshire_rider

    berkshire_rider Growler

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    Thanks, guys. :thumb:
     
  7. ioscope

    ioscope Turbo Monkey

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    I use 27.2 30.0 shims on a cheapy post, I am poor.
     
  8. SilentJ

    SilentJ trail builder

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    Just curious about this - I kind of have my doubts that there are shims for 0.5mm. I have a Roox S4 that's 30.4mm - can I make this work in a 30.9mm seat tube?
     
    #8 -   Mar 1, 2006
  9. BikeGeek

    BikeGeek BrewMonkey

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    Here's a list of what's available from QBP. The smallest I see is 1mm. Like someone else said, you could use an aluminum can.
     
    #9 -   Mar 2, 2006
  10. SilentJ

    SilentJ trail builder

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    Hmmm no dice for the size I need. I guess I'll just see how tight/loose it is and go from there.
     
  11. mtbingdude

    mtbingdude Chimp

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  12. BikeGeek

    BikeGeek BrewMonkey

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