I've acquired a Raleigh Suntour (circa 1990s) frame which I am re-fitting. I need to refit the headset and so I need to know the dimensions of the steerer column. The frame had a threaded stem.

I've measured the external diameter as about 22-23mm (so about 85-86% of an inch). I measured it by applying measuring calipers to the outside of the steerer column i.e not the cups for the ball bearings.

I've looked at various websites (such as Parktool) about standard threaded headset sizes and they say they range from one inch to one and a quarter. So even the smallest standard is quite a bit larger than my measurement.

I've checked my measurement several times and I'm sure it is about right. Do I have a steerer with an obsolete measurement or have I made some silly mistake.

Thanks in advance


  • Are you measuring the fork steerer ( the part with external threads) or the quill stem ( the piece the handle bars attach to)??
    – mikes
    Feb 10, 2018 at 19:26
  • Hi Mikes. I'm measuring the fork steerer.
    – Chris
    Feb 10, 2018 at 20:13
  • Do you really get different values for each measurement? If not, could you give the accurate measurement?
    – ojs
    Feb 10, 2018 at 21:14
  • 3
    90s and threadded? theres a 99% chance its a standard 1" steerer tube.
    – Criggie
    Feb 10, 2018 at 21:18
  • 1
    @Chris You should move your comment to an answer and mark it as answered. This clears it from the unanswered questions list.
    – Max Power
    Jul 4, 2018 at 22:58

1 Answer 1


It turns out I was measuring in the right place (steerer) but I was using my new vermier caliper incorrectly. I've tried again and the steerer is about one inch. Apologies and thank you for all your help

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.