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  1. #1
    cs1
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    1 1/8 or 1 1/4 headset sizing

    I was looking to replacing my son's Trek MTB headset. The locknut is marked 25.4 but the threading is way larger than any 1" quill I've seen. Now I find out it could be 1 1/8 or 1 1/4" How can I tell which it is? Virually no LBS's carry either one in the area. Thanks

    Tim
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

  2. #2
    Svr
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    If the quill of the stem measures 1" exactly, the bike is equipped with a 1 1/8" headset. Another way to tell is to measure the distance between the flats on the top nut of the headset -- genrerally 1" = 32mm, 1 1/8" = 36mm, 1 1/4" = 40mm.

    1 1/8" is a very common MTB headset size. I'm suprised none of your local shops stock it.

  3. #3
    cs1
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    Quote Originally Posted by Svr
    If the quill of the stem measures 1" exactly, the bike is equipped with a 1 1/8" headset. Another way to tell is to measure the distance between the flats on the top nut of the headset -- genrerally 1" = 32mm, 1 1/8" = 36mm, 1 1/4" = 40mm.

    1 1/8" is a very common MTB headset size. I'm suprised none of your local shops stock it.
    Thanks for the info the actual quill is " and it uses a mm wrench. Problem is I didn't know exactly what size it was. I appreciate the help.

    Tim
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

  4. #4
    cs1
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    Problem solved. I called around and found a LBS that had steel locknuts in black for $3 ea. He saved me taking off the headset and fork race to replace the entire unit. That old aluminum locknut stripped out real fast. Thanks for the replies.


    Tim
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

  5. #5
    Senior Member DieselDan's Avatar
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    1 1/4" headsets are usually Cannondale Headshocks.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

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