1 1/8" forks in a 1" headttube, have a look at my IS41 adaptor and let me know what you think!

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ffm in reply to @jetski

You could machine it for a tighter interference fit and then heat the cup before pressing it on, especially since aluminium expands more than steel with heat.

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jetski in reply to @ffm

This is actually a brilliant idea.

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ffm in reply to @jetski

Don't crack the cup though! It might be more of a risk if the headtube is slightly oval. I can't think of a way of making it more cylindrical without turning it on a lathe, but it might be worth half an hour with your best calipers and some very fine abrasive paper once you've taken the paint off.

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