11/20/2025: Dear Friends, I am currently in chemotherapy and unable to promptly answer emails or ship orders. I will do my best to take care of your needs, but hope you can be patient. Thank you all for your support.

Seat post shims

Seat post shims on this page:

Starting seat tube diameter and resulting shimmed diameter:
29.8mm down to 27.2mm
29.4mm down to 25.4mm
29.0mm down to 26.4mm
28.0mm & 26.4mm to 25.4mm
27.2mm down to 25.4mm
25.4mm down to 25.0mm

We don't have an on-line shopping cart. If you see something that interests you or if you have a question, please call us at (503) 480-2001 or email: sscycleworks@comcast.net

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29.8mm down to 27.2mm seat post shim. New, $15.00/each

Part# 41233

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USE 29.4mm down to 25.4mm carbon fiber shim. New, $20.00/each

Part# 41231

You won't be adding too much weight with this shim.

Here's another look at the shim.

It's made for a frme with a 29.4mm set tube,

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29.0mm down to 26.4mm alloy shim. Used, $15.00/each

So there's no doubt about its size.

Here's the other side of the shim.

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Tranz X 28.0mm & 26.4mm to 25.4mm alloy shim. New, $15.00/set

Part# 41232

Two shims

Here are the shims out of their package

Fit together

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27.2mm down to 25.4mm alloy shim. New, $15.00/each

Part# 41226

Side view

From a different angle

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USE 25.4mm to 25.0mm aluminum shim. New, $15.00/each

Part# 41236

We have two in stock.

New, in the box.

It's for a frame with a 25.4mm seat tube.

Some important info