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ISO One Inch Threaded Headsets

This is the size used on most high quality bicycles manufactured before the late 1990s.
See also Sheldon Brown's Headset Crib Sheet

ISO Standard Dimensions:

Cup outside diameterCrown race inside diameterThread sizeStem diameter
30.2 mm 26.4 1" x 24 tpi7/8" / 22.2 mm


Grand Cru

Velo Orange Grand Cru HD1264 $44.95 buy button 

Very nice quality 1" threaded headset.

  • Over-sized sealed bearings
  • Alloy construction
  • The fork crown race is split so it slides on without tools
  • 42mm stack height
  • 26.4 (ISO) crown race


  •   HD1280

    Origin8 Pro HD1280 $29.95 buy button 

    Excellent value in an alloy headset with sealed cartridge bearings.

    CNC machined 6061-T6 aluminum alloy cups. Silver.

    Comes with both 26.4mm and 27.0mm crown races.

  • Cup Diameter: 30.2mm
  • Stack Height: 42.5mm
  • Weight: 110 grams



  •  

    HD1001

    Tange Levin ISO HD1001 $24.95 buy button

    Excellent value in a steel headset, using 5/32" ball bearings.

    Stack height: 33.4 mm Weight: 149 grams






    spoke

    Click on the link for your size:

    For Threaded Steerers
    1 inch
    ISO
    1 inch
    J.I.S.
    1 inch
    B.M.X.
    1 1/8 inch
    Threaded
    1 1/4 inch
    Threaded
    French
    thread
    Road bikes
    older mtbs
    Old Japanese
    size
    BMX, Cruisers
    Old MTBs
    Newer mtbsRareOlder French
    bicycles

    For Threadless Steerers ("Aheadset," et. al.)
    1 inch Threadless1 1/8 inch Threadless1 1/4 inch Threadless
    Some mtbsMost
    Newer mtbs
    Newer mtbs

    See also Sheldon Brown's Headset Crib Sheet

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