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  1. #1
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    How to pick size of 1" threaded headset?

    I'm replacing a 1" threaded headset. I haven't pulled the old one off yet but am certain it's toast. Looking online for a new one I see I can pick from 26.4 or 27.0 crown. Is that going to be marked somewhere on the old one? If not, how do I know which to pick?

    Thanks

  2. #2
    cab horn
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    You pull the old crown race and measure the fork crown race seat. Newer 1" is certainly almost going to be 26.4
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  3. #3
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    Thanks for the reply. This is a mid-90's Diamondback lower end mtb. Would that be considered new enough to be 26.4?

  4. #4
    AEO
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    that would be questionable territory.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
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  5. #5
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by jzsoup View Post
    Thanks for the reply. This is a mid-90's Diamondback lower end mtb. Would that be considered new enough to be 26.4?
    You sure it's 1"? By the mid-'90's, most mountain bikes were using 1 1/8" headsets except for some odd holdouts like Bridgestone.
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  6. #6
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    Quote Originally Posted by Jeff Wills View Post
    You sure it's 1"? By the mid-'90's, most mountain bikes were using 1 1/8" headsets except for some odd holdouts like Bridgestone.
    That's a good point. My 1993 Trek 7000 MTB was certainly 1-1/8" threaded and I believe that size was common by then.

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