JIS/ISO crown race

Posted on Mon 10th, June 2013

• #1

dglshrn

Righto, got some (what I'm led to believe are) Roberts forks on a new frame but the crown race is 27mm, ie. JIS/Italian thread.

My question is: is it worth getting a new headset or should I just get the crown race machined to ISO? The headtube internal diameter seems right, it took a Chorus headset no problem.

Anyone know if Vaz does this sort of thing? I wonder if he could remove a totally fucking stuck bottom bracket for me as well.
• #2

frank.f

I have filed down plenty of JIS forks to fit an ISO headset. It really isn't much work and pretty hard to mess up. If you buy a new headset then you will have the oposite problem of the cups not fitting properly in the head tube which could be worse if the press isn't tight enough.

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JIS/ISO crown race

Posted by Avatar for dglshrn @dglshrn

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