Calculations I got with out "squish".
Stock
275/55R20-2546mm
Spare
275/65R18-2559mm
Difference tells me spare has 1/2" more tire in circumfrance. The post I did earlier this thread about being about equal is not true. The spare should only be ran as a spare(temporary) unless you change all 4 wheels to that size or get a 20" spare.
Lars
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