Wanted 1" JIS Crown Race - Shimano mid 90's

[montair]

On a new project which i didn't bother measuring until everything got a bit no fitty no fitty.
Suffice to say I have a perfectly good 1" ISO 105 Headset (HP1055) and need a JIS crown race.

From a little bit of digging the race diameters are the same so if some one has a Mid 90's Shimano JIS crown race I should be able to swap them ( unless some one knows anything different ???).

I will cross my fingers for a couple of days before admitting defeat and then getting a complete JIS and returning the ISO to the bottom draw.
Unless some one wants a swap ?

 

[Tootyred]

The top and bottom cups are not the same size between iso and jis.

You can put a 30.0mm iso cup into and 30.2mm jis frame, but..........or is it just your forks that are jis?

I have also had mixed experience of swapping headset components, especially if you want a functional seal between the race and the cup.