The difference is: ... 0.4mm ...
And it is where it matters, on the thread.
The dome wheel nut has a reduced thread engagement, hence it is easy to spin on the door studs. You don't want this reduced thread engagement on your road wheels... Hence the warning in the user manual.
And yes, you made me go out and measure them tonight.12.5mm standard versus 12.9mm domed internal diameter.
Cheers
Ron


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