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For a 1" headset it needs to be 22.2mm (standard)
A 25.4mm (1") is the size that fits in a 1 1/8" (OverSize) headset.
Wanted Girvin flexstem 1 inch and not too long
- Thread starter longun
- Start date
A 25.4mm (1") is the size that fits in a 1 1/8" (OverSize) headset.
tractordrafter
Old School Hero
I could post it to you for £25 all in?
edit: new post above suggests that this won't be a suitable dia.
edit: new post above suggests that this won't be a suitable dia.
I am now confused. Below is a photo of the original headset, which I have checked with calipers and it measures 25.4mm. Therefore I would expect a 25.4 dia Flexstem to be a correct replacement? Welcome clarification
tractordrafter
Old School Hero
If that's the stem then mine is an identical OD
tractordrafter
Old School Hero
Dropped you a PM
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A headset is the outside diameter of the steerer tube.
For threaded, the then stem goes on the inside of the steerer, so is smaller than the 'headset size' by 1/8"
For an Aheadset/Threadless, the stem goes on the outsize and is therefore the same measurement as the headset.
Hence a 25.4mm quill stem is for a 28.6 -- 1 1/8" headset.
Something many threaded era people* don't realise and advertise wrong (or right and the buyer doesn't realise)
*or people who have forgotten because they're now 30 years older and honestly didn't even think to think about it. Happens to all of us.
@tspicer it was @longun looking for a stem, this would not work for him.
If you see his second post, you'll notice he already had that advertise wrongly thing
You have a 1 1/8" threaded headset, if you're ever looking for a new one.
For threaded, the then stem goes on the inside of the steerer, so is smaller than the 'headset size' by 1/8"
For an Aheadset/Threadless, the stem goes on the outsize and is therefore the same measurement as the headset.
Hence a 25.4mm quill stem is for a 28.6 -- 1 1/8" headset.
Something many threaded era people* don't realise and advertise wrong (or right and the buyer doesn't realise)
*or people who have forgotten because they're now 30 years older and honestly didn't even think to think about it. Happens to all of us.
@tspicer it was @longun looking for a stem, this would not work for him.
If you see his second post, you'll notice he already had that advertise wrongly thing
You have a 1 1/8" threaded headset, if you're ever looking for a new one.
Spankyfart
Marin Fan
The man is correct.
tractordrafter
Old School Hero
So for clarification, a threaded no threaded adheadset headset without threads with an internal diameter matching the external diameter of an internal bore of 1" is equal to an external bore of a 1/16" wall thickness of a thickness of 1/16th of an inch, resulting in a 1" flex stem - roughly equating to a 25.4mm OD is correct?
Seems a bit compicated
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Perfect 
