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Just one comment to above pictures: As long as some of You will question star marked tyres, i will have a job:)The knowledge is there for many years. Buy cheap tyres, pay high diff/gear/transfer box bills. If you can not afford to pay £900 for set tyres on high tech 4x4 BMW, go and buy a ford fiesta....
So if BMW recommends that and it's 1.1% out then that is okay,but how far it can be out before it causes probs I haven't found as yet.
All the handbook says is to fit star rated tyres as these have been recommended by the manufacturer.
Simplest way to test the theory is to put whatever tyres on you want, and let us know how you get on...
I may give non run flats a go as I’m not convinced by the arguments. I don’t think the issue is that tyres have to be run flats. I think it’s more they have to be a certain radius and have to maintain close to that radius. As long as the tyres I buy do that, I really can’t see what problems there would be. Cost is not an issue befor anyone pipes up, I’m happy to spend same money as run flats would cost. I had a m3 before this and even with its much firmer suspension, it didn’t jar as much as the x5 when going over pot holes at speed. It’s ridiculous and I can only assume it’s the run flat tyres.