Quote:
Originally Posted by ted920
which slightly modified tire size would work for the rears:
1) 3105/35/21
or
2) 315/40/21
I ask because both of these sizes have full WINTER tires available while the factory 315/35/21 rears are only presently available in an ALL SEASON tire.
Feedback is greatly appreciated.
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Check out this site for comparisons. You need the diameter to be as close as possible to OEM, and the tire must also be compatible with the rim width.
https://tiresize.com/calculator/
As to how much of a difference in diameter is tolerable, I cannot answer that. My CA at my dealer told me for xDrive that it was more important to match diameter on each axle (L&R) vs. front and back. However, I am not sure that is true, but it does make some sense.