bad4d Posted June 2, 2010 Report Share Posted June 2, 2010 I have Pirelli 275/35-20 that come w/ the 40th pkg. I have to recalibrate my Speedo I calculate 756 revs per mile. Pirelli figures 751 revs per mile. With an online calculator it is 731 revs per mile. Does anyone actually know what the correct number is? Link to comment Share on other sites More sharing options...
blkGT500nCA Posted June 2, 2010 Report Share Posted June 2, 2010 I've got mine (now) at 720 and my speedo is perfect. Edit: Tirerack lists them at 732. Link Link to comment Share on other sites More sharing options...
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