I'm working on an old 70s-vintage steel road frame, and I'm concerned about finding a suitable headset. Measured with a caliper, the head tube ID comes out to about 30.75mm. I thought that maybe it was simply worn, but what's left of the old crowns fit snug, and measure in at 30.8mm.
I've looked around on the 'net and I haven't found any reference to such an odd-sized tube. Can anyone tell me what I'm dealing with here? Are shims available to let me fit a "standard" headset, sized for a 30.2mm head tube?
Originally posted by halmot I'm working on an old 70s-vintage steel road frame, and I'm concerned about finding a suitable headset. Measured with a caliper, the head tube ID comes out to about 30.75mm. I thought that maybe it was simply worn, but what's left of the old crowns fit snug, and measure in at 30.8mm.
I've looked around on the 'net and I haven't found any reference to such an odd-sized tube. Can anyone tell me what I'm dealing with here? Are shims available to let me fit a "standard" headset, sized for a 30.2mm head tube?
Never heard of such a thing, or shims of that size either. Ask Sheldon Brown at www.harriscyclery.com
Originally posted by boudreaux Never heard of such a thing, or shims of that size either. Ask Sheldon Brown at www.harriscyclery.com
Update:
As usual, Sheldon did have an answer (I do try to spread my dumb questions around, so as not to be too much of a pest to dear Mr. Brown).
It appears to be an old Austrian standard. A bit more research revealed that some of the Sears department-store frames of this vintage were manufactured by Steyr/Puch.
