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I've found the speedo to be off from the factory, on both my M850i and my wife's X7. Both are over by 2mph. There's three radar signs near my house and all show it over by 2. OEM wheels and my aftermarket 21s give same results. Drove a rental audi by them and mph matched. My 21s are 21x9.5 et26 front. 21x11 et36 rear. Sit flush once lowered on KW HAS. At factory height they poke out. Can post pics later from my desktop. Mobile gives me issues here.
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