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Does anything need to be done with the TPMS system when swapping out my 20" tires (and the spare) with 18s? Or will the computer adjust automatically?

Is the psi the same for 20s versus 18s and if not how to set it so the system reads them correctly?

I ask because I plan to purchase a set of 18s and swap them myself in the driveway in the winter or when necessary (including the spare).

Thanks in advance.