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Old 06-05-2019, 02:48 PM   #4
BYprodriver
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Join Date: Oct 2008
Location: O.C. CA
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Quote:
Originally Posted by Anker View Post
If you have PSM there is a possibility that the different wheel diameter will confuse it and cause interesting things to happen. As a rule, the outside diameter of the wheel should not change, unless you do so for all four wheels. PSM uses rotation sensors in the wheels to determine whether they are slipping.

A 245/40/17 has a smaller outer diameter than a 255/40/17.

Wheel diameter is irrelevant, tire diameter is what matters.
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