18mm is more than enough thread to hold the wheel onto the adapters, i'm going to be running a set of the design 2s in 18mm in my own car this year, and i'm aware of several other people with the same setup who haven't encountered any problems.
id start worrying at less than 10mm of thread, but anything more than that and you're totally fine.
id start worrying at less than 10mm of thread, but anything more than that and you're totally fine.
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