Not only for old school mountain bikes, but also for classic touring bikes. It is a thread stem that corresponds to the column diameter of the precious oversers now.
There are people in Circles who haven't looked anywhere!
How about overhauling an old motorcycle?
Then put a thread on a fork with oversized ahead and use a threaded headset.Isn't it a ridiculously cool bike !?
For example, using the thread stem of SURLY / LONG HAUL TRUCKER !?
With the current frame project, you can build a bike with a classic feel!
・ Column diameter / Steeler Dia .: 25.4mm
(Compatible with 1-1 / 8 "head tube threaded headsets.)
・ Handle clamp system / Clump Dia .: 25.4mm