Quote:
Originally Posted by limeypride
Below is part of the email I sent to my buddy at BMW Bellevue before I made the change
STOCK
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275/35 = 86.6
285/35 = 87.5
... front:rear circumference delta = 0.9" (rear is larger)
ME
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285/35 = 87.5
295/35 = 88.3
... front:rear circumference delta = 0.8" (rear is larger)
... - 0.1" relative to stock
He said BMW won't confirm whether my -0.1" circumference delta is supported or not but he felt it was within tolerance since it's actually closer to 1:1.
@OP, here are your numbers. I don't understand the tolerances at play here--I'll leave that to the experts--but the difference is substantial enough to give me pause. I'm not sure if the reversal as to the larger circumference is significant.
OP
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285/35 = 87.5
305/30 = 85.4
... front:rear circumference delta = 2.1" (front is larger)
... + 1.2" relative to stock
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It seems like tire size isn't the problem. Perhaps the axle was disturbed during lowering spring installation and not seated correctly.