30mm vs 30.2mm.


30.2mm is the standard.

I know an old fuji i have has 30mm that came out. They will fall right into a "standard" frame that takes the 30.2mm cups and those cups wont go in the old fuji frameset.


Can you still get threaded 30mm headsets for the older bike boom bikes like lower end fujis of the late 70s? I just learned today that bikes have 2 different cup sizes. 30mm and 30.2.


My go to headset for older bikes has always been the Tange Levin. Great headset but i dont think it comes in the 30mm size.