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Seatpost Shims

berkshire_rider

Growler
Feb 5, 2003
2,557
10
The Blackstone Valley
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:
 

chicodude

The Spooninator
Mar 28, 2004
1,057
1
Paradise
I've got a shim in for my post.......works fine. Only thong is that the QR has to be tightend a little more.........
 

Jeff 151

Monkey
Sep 25, 2004
176
0
DeezBay, Cali
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?
 

dorfonbikes

Chimp
Apr 29, 2002
25
0
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 :)
 

SilentJ

trail builder
Jun 17, 2002
1,312
0
Calgary AB
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?