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You can do the maths for yourself, but the chances are that 8mm is a small enough difference that you'll ride around it with no trouble.
An extended crown race is possible and wouldn't be hard to make, it's just turning. The "high BB" option pack on the old Isaac Velocity included one
gbj_tester-
Thanks BTW, I also did find this https://www.bikester.co.uk/reverse-05-angle-spacer-1-18-1296181.html
And as you say I'm sure I could get an adaptor turned by someone skilled in such things.
stelfox
is there a good way to use a 400mm a-c carbon fork in place of a 408mm steel fork? I guess like a 8mm thick crown race or something.