I've never seen them crack unless they've been hit off something.
I had rota's on the R32 for over 4 years and they didn't even have a buckle.
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Irish roads are shite=Fucked wheels. Simples
Ive had Rotas delivered cracked.
Was fluke that it was noticed on this occasion so Id not blame the tyre fitter tbh.
I just double check twice ever since.
Live & learn.
Too late once tyre is fitted.
But it has to get an impact somewhere along the way to crack.