My current stem is 25.4 mm in diameter. It's way too low and long. It's a threaded fork.

I have a nice quill stem adaptor that's 22.2 in diameter that would be nice to use.

Are there any shims to go from 22.2 to 25.4 and is it worth it?

I found some from Problem solvers but it seems to be for threadless stems only.

what would you do? would a shim be safe here or is it a no-do?

UPDATE: I found a shim and installed it. It works really good. Much better than my old crappy quill stem.

  • You probably could use a shim, but you'd have to make your own, and I can't find any 1/8" brass sheet online. Aug 7, 2017 at 1:13

1 Answer 1


Threadless quill stem adaptors do commonly come with a shim, so that they can be used with either size steerer, e.g. http://harriscyclery.net/product/velowerx-universal-stem-adapter-quill-to-threadless-5423.htm

I've never seen such a shim sold separately, but a search shows up https://www.amazon.co.uk/Alloy-Aluminium-Quill-Adapter-Quillstem/dp/B00K7ECRLO, which is currently unavailable, but was sold at some time, so you might find one.

  • Here's one: ebay.co.uk/itm/…
    – armb
    Aug 8, 2017 at 13:48
  • 1
    (Just buying a new quill stem, or a new oversize adaptor, would still be a neater solution, so the fact that a shim would work doesn't necessarily mean it's worthwhile.)
    – armb
    Aug 8, 2017 at 13:50
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    Thanks! I also found this one rosebikes.se/product/detail/aid:27776 I'll se if it works.
    – Ola
    Aug 8, 2017 at 18:37
  • Have been running it for a while now and it seems to work really good. So far no problems.
    – Ola
    Feb 20, 2018 at 18:15

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