View Single Post
      10-13-2012, 08:57 AM   #14
HotRodW
Second Lieutenant
HotRodW's Avatar
United_States
8
Rep
234
Posts

Drives: 2013 X1 xDrive28i M Sport
Join Date: Sep 2012
Location: Southwest Michigan

iTrader: (0)

Quote:
Originally Posted by Bimmerized View Post
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.
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.
Appreciate 0