Bicycle Mechanics - How to pick size of 1" threaded headset?

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.



PDA
jzsoup
06-10-10, 08:30 PM
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

operator
06-10-10, 08:34 PM
You pull the old crown race and measure the fork crown race seat. Newer 1" is certainly almost going to be 26.4
jzsoup
06-10-10, 08:37 PM
Thanks for the reply. This is a mid-90's Diamondback lower end mtb. Would that be considered new enough to be 26.4?

AEO
06-10-10, 08:43 PM
that would be questionable territory.
Jeff Wills
06-11-10, 12:27 AM
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.
HillRider
06-11-10, 06:03 AM
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.