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  1. #1
    Banned. Mr. Beanz's Avatar
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    I'm confused...headset size/quill stem

    I've got a Burley Duet spec'd with a 1 1/8 headset.

    Wanting wider bars and maybe a bit more height on the stem but old parts are hard to find just walkng into an LBS or Performance type shop. so I figured I might use a quill adaptor. This is where I am confused. Shouldn't the original stem on the Burley say 1 1/8 on the quill stem?

    I pulled it out and found 25.4 stamped into the stem which is 1 inch.

    I passed on the quill adaptor I saw at Performance because I though I needed one that was stamped 1 1/8.

    The quill adaptors at Performance measure 1 inch in diameter, Would it work on my tandem?

    I did have the headest changed to a Chris King year ago but that wouldn't explain the size of the quill stem.

    Maybe 1/18 headset has nothing to do with the quill stem diameter? I'm lost.

    Anyway, if I can use the adaptor, I can easily find new bars and stems in local shops.

    Thanks for any clarification.


    1997 Burley Duet
    http://www.bikepedia.com/QuickBike/B...Duet&Type=bike

  2. #2
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    On a "quill" stem, the outside diameter of the quill matches the inside diameter of the steerer tube. "Headset size" always refers to the outside diameter of the steerer. Old, "road standard" forks used 1" diameter steerers and 22.2mm (aka 7/8") diameter quill stems. When "oversize" mountain bikes with 1 1/8" and 1 1/4" headsets came along, they matched up with 25.4mm (1") and 28.6mm (1 1/8") diameter quills. Does that help?

    Just don't ask me about threadless headsets or I'll beat you with a turkey drumstick.
    Jeff Wills

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  3. #3
    Banned. Mr. Beanz's Avatar
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    Quote Originally Posted by Jeff Wills View Post
    On a "quill" stem, the outside diameter of the quill matches the inside diameter of the steerer tube. "Headset size" always refers to the outside diameter of the steerer. Old, "road standard" forks used 1" diameter steerers and 22.2mm (aka 7/8") diameter quill stems. When "oversize" mountain bikes with 1 1/8" and 1 1/4" headsets came along, they matched up with 25.4mm (1") and 28.6mm (1 1/8") diameter quills. Does that help?

    Just don't ask me about threadless headsets or I'll beat you with a turkey drumstick.
    Cool! I got it! Thanks for the clarification

    Inside dia is 1" and the thickness of the tubing creates the outside dia of 1 1/8

    Thanks no drumstick neccesary .

  4. #4
    coprolite fietsbob's Avatar
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    yea , ID is inside, OD is out side, tube's wall thickness is in between them .

    the headset crown race seat is bigger than the steerer OD,
    for some metal to be there for final machining of the seat site..


    my bike friday uses a King headset for 1.125" OD threaded steerers.. it is their Grip nut type.

    regular 2 nut types there is interchangeability on the threaded or un-threaded type,
    the part that meets the bearing on top, so the headsets can be switched over.
    Last edited by fietsbob; 11-21-12 at 10:57 PM.

  5. #5
    Senior Member zukahn1's Avatar
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    Also quill adapters have two sizes on each the size of the quill that goes in the fork and the size of the post top where the stem attaches.

  6. #6
    Senior Member
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    Quote Originally Posted by zukahn1 View Post
    Also quill adapters have two sizes on each the size of the quill that goes in the fork and the size of the post top where the stem attaches.
    Correct. Most have a true 1-1/8" outside diameter upper section where the stem goes and either a 25.4 mm diameter (1-1/8" steerer) or 22.2 mm (1" steerer) for the quill portion.

  7. #7
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    First off I wanna say I'm knew to this forum.

    2ndly, I have a Gary Fisher AL 1 mountain bike from the early 90's and I want to determine the headset size too. I pulled the handlebar stem and the quill measures 1 1/8"..does that mean the headset is 1 1/8"?

  8. #8
    Senior Member Grand Bois's Avatar
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    Re-read post #2 .

  9. #9
    Senior Member demoncyclist's Avatar
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    No, you have a 1 1/4 headset. See post #2 above...
    DEMON

    Satanic Mechanic
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