Quote:
Originally Posted by Humtek
This is false.
You can run staggered on a AWD. You just have to make sure the rolling diameter has a difference less then 1%. BMW would not sell staggered setups with the XI if it couldn't run staggered.
The popular setups are:
235/35/19
265/35/19
or
235/35/19
275/30/19
Not all brand of tires have the same rolling diameter even if the size is the same.
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235/35-19 F 265/35-19 R IS NOT OK FOR Xi! F/R speed difference is 3.2%. You will definitely kill your transfer case clutch pack.
Even 235/35-19 F 265/30-19 R is not the best. F/R speed difference is -0.8% (rear tire being smaller). Too close to the 1% limit for comfort.
If you have to have 19" staggered in an Xi, you should go 235/35-19 F 275/30-19 R. Speed difference is 0.1%. Just make sure you have the correct offsets so nothing will rub.
FYI - The factory set-up of 225/40-18 F 255/35-18 R has a speed difference of -0.2%.
For the OP - Don't drive your car until the tire size issue has been resolved. With 2.5% speed diference in your setup according to my calculation, you are playing with fire. If you smell smoke, it will be your clutch pack burning!! (You won't exactly smell smoke but you know what I mean.)