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      02-11-2012, 01:31 AM   #11
EBRSKIH
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Drives: F10 550i
Join Date: Jan 2011
Location: Chicago

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Quote:
Originally Posted by Hunter5179 View Post
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.
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..
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2013 X6 50i Sapphire Black
2012 550x Alpine White
- 12.727@108 - 1.7 60ft lemon'd
2011 550i Sapphire Black
- 12.960@109 - lemon'd
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