Originally Posted by contractor
I thought the cracking was due to the stiff sidewalls of the RFT transferring the energy of the car hitting bumps straight through to the alloy wheels? With that in mind, putting non RFT on the car would mean that the tyre dissipates the energy better, protecting the wheels.
Has anyone heard of people with non RFTs having cracked alloys? I haven't but am interested to find out.
I think you are correct about your theory and this will reduce the chance of cracking, but people on the forum have still had cracked alloys with non run flats and BMW will use any excuse not to replace the alloys.
If I could guarantee that mine wouldn't crack with non run flats I'd change mine tomorrow even though they are only half worn.