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Are all 1" threaded headsets size equivalent?(7 posts)

Are all 1" threaded headsets size equivalent?MLCrisis
Feb 7, 2003 10:52 AM
I rescued a nice old Raleigh frame from the trash heap. The frame itself is in good physical shape (powder coating it to improve esthetics), but the BB and headset are shot. I think I've got a replacement BB covered...are there any special sizing issues for 1" threaded headsets or can I make a purchase of most any new unit with confidence that it will fit?
There are variations.brider
Feb 7, 2003 11:08 AM
The head tube races have different outside diameters, and there are a couple of crown race inside diameters. Measure to be sure.
re: Are all 1" threaded headsets size equivalent?MR_GRUMPY
Feb 7, 2003 11:30 AM
The Raleigh probably has a standard English 1" headset, but if you didn't know the country of manufacture or age, it could have a Italian or French threaded headset.
In the last 10 years, all but the English have gone by the wayside.
If anybody knows that I am wrong, please let me know.
Watch the stack height, tooStraightblock
Feb 7, 2003 3:37 PM
From Sheldon Brown:

"The stack height is the vertical space taken up by the headset. With a conventional threaded fork, the steerer tube is longer than the head tube by some amount. If a headset is chosen with a stack height greater than this difference, there may not be enough of the steerer free above the upper bearing race for the keyed washer and lock nut to be installed."

If you have all the old parts, see if the LBS can match something up for you.
re: Are all 1" threaded headsets size equivalent?curlybike
Feb 7, 2003 6:45 PM
What is the brand and possibly model of the old HS. We should be able to quote you a stack ht. if you furnish that info. Or you can measure the head tube of the frame between the HS cups(the painted part) and measure fron the bottom of the crown race to the top of the steerer(remove the top nut) subtract the smaller # from the bigger#, that is the stack height of that installation.
Nope, not even close.Spoke Wrench
Feb 8, 2003 6:41 AM
Probably the key issue is the value of the bike.

High end bikes are made with better grade steel tubeing. This allows the manufacturer to use a thinner tube wall thickness without losing strength. Consequently, the parts that are pressed into or onto the tubes, like the cups and crown race, have to be different sizes to allow for the tubeing differences.
the numbers acording to QBP for 1"Rusty Coggs
Feb 8, 2003 3:33 PM
Threaded ISO: 26.4 crown race and 30.2 mm cups. JIS maybe still used on some low end oriental stuff:27.0 crown race and 30.0 cups. Threadless 1" is same as ISO.As for tubing strength,the ID can be the same even tho the tube itself is thicker or thinner as strength might dictate. Some years ago,there were pretty good bikes made in Japan with the JIS standard HS.