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There are two schools of thought regarding wheel sizes, 1) keep them all the same size, and 2) wider wheels in the back. Some folks have put the same size all around (say 18x8.5 for example) and others go with wider rears. I've heard two thoughts on #1 - talking with the folks at Dinan, their opinion is that the car is so heavy, that you want the same contact patch all around. The other thought is that it's easier to rotate tires if they're all the same (especially if your running directional tires).
The obvious thought on having wider rears is putting more power to the ground and maintaining stability through larger contact patch.
So, I'm soliciting your opinions - same size all around vs. wider in the rear (and please don't quote those stupid car commercials - "Wider is Better".)
Appreciatively,
Stan C.
'92 850iA