Quote:
Originally Posted by Hunter5179
245/35/20 fronts Speedometer Difference: 0.154% too slow with a diameter difference of .15%..............For 275/30/20 rear's Speedometer Difference: 0.834% too fast with a Diameter difference of .83%........For 285/30/20 rears the Speedometer Difference: 0.077% too slow with a Diameter Difference of .08%
The difference in rolling diameter for either of these compared to stock is really negligible and should not affect the x drive at all.. Its when rolling diameters exceed 2.0% and definitely above 5% is not good.
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So the dealer will agree that there will be no problem? I honestly have no clue how you got these numbers but it seems like you know what youre talking about. The way I thought about it was that the 245/285 setup will work because the X6 runs a 275/315 which is a 40 difference from the front and the rear as is the 245/285. But then again I thought that the profile of the tire would have to be adjusted in order to have a synchronized spin between the front and rear..