Can I tell the inner diameter of my 1" head tube without removing the headset?

Question

I need to replace my 1" threaded headset, but to my surprise the replacement headset is available for either 30.0mm or 30.2mm inner head tube diameter. Is it possible to tell which one I need without removing the headset cups?

JoeK · Accepted Answer

Probably not.
Knowing the manufacturer of your bike gives a clue but not always definitive.
One is the Italian size and more common. The other is Japanese.

Can I tell the inner diameter of my 1" head tube without removing the headset?

One Answer

Add your own answers!

Ask a Question