Quote:
Originally Posted by Bimmerized
why not just measure as I did? Tire diameters are NOT exactly the same if you have the 19" or staggered option, plus inflation pressure pressure as well as tire wear comes into play.
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I already measured your way, too, as noted above. And yes, the tire diameters are essentially the same. Identical? No, but close enough that BMW doesn't have a problem using 17", 18" or 19" wheels interchangeably without affecting the speedo. (Not that it should matter since apparently BMW speedometers are more of a guideline than actual speed measurement anyway.) As long as you "minus-size" the tires correctly by adjusting the aspect ratio, the overall tire diameter remains very close.