Thread: 19x10.5 rear
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      02-27-2012, 04:48 PM   #6
Alpineweiss e90
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Drives: AW 330xi
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The general rule is to keep the rolling diameters of the font and rear tires within 1% of each other.

But I'm not 100% convinced this is a mandatory guideline. For starters, BMW provided Canada spec models with a staggered option from the factory on XI models. Also, the transfer case has a multi-clutch setup that should match different speeds.