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Hi Steve It doesn't matter whether they fit, with just about all AWD/Xdrive cars the rolling radius front to rear must be with a given tolerance to avoid transfer case damage. As an example my X5 summer wheels are staggered Front 91/2J x 20 Rear 101/2J x 20 Tyres Front 275 x 40 R20 Rear 315 x 35 R20 My winter wheels are 9J x 18 Tyres are 255 x 55 R18 all round The staggered summer set need the difference in rolling radius front to rear to maintain the rolling radius. The tyre sizes that you have been offered are as advised by BMW even if the wheel sizes are not. You also need to consider wheel offset so as not to upset geometry in the suspension. Are you wanting Wider tyres or deeper side wall ? What ever you go for if the rolling radius is out front to rear you could end up with an expensive repair bill for the transfer box or a Diff Dave