Quote:
Originally posted by grnSVX96
interestingly my wifes car a BMW X5 4.6is has its std 20 in rims with different sized tyres front to back - 275/40x20 fr and 315/55x20 rears Michelins they recommend 220kpa both ends..running these thru tyre calc computers these are way out, so they obviously must balance each other out with the weight of the engine over the front..
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I think it's more likely that BMW has geared the car to handle the difference in wheel and tire sizes in the first place. I don't know the X5's AWD system, so I don't know how much better or worse it can handle the difference.