Sorry to bump an "older" thread, but what is the max variance that is allowed for revs per mile front to rear? I feel as previously stated, that comparing actual manufacturers specs is the best way to determine the front to rear variance on a staggered set up. For example, the 2 sets of tires in 2 different sizes I'm looking at have a small variance in revs per mile (set 1-FR 813, RR-818, and set 2-FR 800, RR 805). In this case there is a 5 rev per mile difference from front to rear. What is the maximum allowance to SAFELY run on our Xdrive?
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