Quote:
Originally Posted by Gypsyking
Quote:
Originally Posted by remmib
With xDrive it's important to keeping the diameter of the front and rear tires the same to avoid problem with the transfer box.
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That's interesting indeed.
I assume the car came from the factory with this staggered tire set up.
As per Tire Rack the rolling diameter of the front tires (245/35R20) is 26.8" while that of the rear tires (275/30R20) is 26.5". The difference in rolling diameter is 1.13 percent. I guess BMW is okay with that & by corollary difference of 1 percent in rolling diameter does not put adverse effect on the AWD system. |
All BMWs comes with star marked tires from the factory. These are what you can call OEM tires, and they're made for and approved by BMW.
And as I understand it, the staggered tire setups on xDrive models are made so they have the same circumstances, even if they in theory should have an one point something percent difference.