Thread: Go with 4 20X9?
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      03-08-2024, 10:01 AM   #2
Opie55
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Drives: '15 650i Convertible
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The "square" setup from the factory used the 8.5" at all four corners. The 9" was for the rear of "staggered" cars like yours. The 9" has a 44 mm offset. The 8.5 has a 33 mm offset. If the offsets were the same, the 9" would sit 1/4" closer to your suspension up front (1/2" wider, but half of that is on each side of the wheel centerline). But the greater offset of the 9" - by nearly 1/2" (11mm) means it will sit even closer - nearly 3/4". I doubt you have that much clearance to your struts. So while there may be a 9" that will work, I don't think yours will. Try one and see.
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