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Old 06-10-10, 08:30 PM   #1
jzsoup
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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?

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Old 06-10-10, 08:34 PM   #2
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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
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Old 06-10-10, 08:37 PM   #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?
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Old 06-10-10, 08:43 PM   #4
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that would be questionable territory.
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Old 06-11-10, 12:27 AM   #5
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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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Old 06-11-10, 06:03 AM   #6
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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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