I'm running 225M with non rft Vredstien Sessanta tyres. 235/35 up front and 265/30 rear
The ride is sooo much better - I believe the harder sidewalls to the run flat tyre were the main cause of the wheels cracking. That said I think my rears were replaced before I bought the car as they definitely don't look as corroded as the fronts around the hub.
Hth
S
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