Shouldn't matter much....it is just a tad taller but not by much. Since it is also narrower at 255 but slightly tall at 70 should be not much difference from 265 and 60 series. The overall circumference should not change much. Your mile per hour may differ 1 mph based on that. I won't lose sleep over it. I did it similar from 265/60/18 to 255/55/18. I felt a little more bump due to the lower series but you shouldn't.
^^lol^^....
new size will be 1.6'' taller and the speedo will show about 5% slower
Hi all..I'm new here. I bought a white '08 2WD Limited 4.7 yesterday. Stock Michilins have 52K and are done. I anyone here running 255/70/18 on similar model. I'm looking at Revos in that size. They're a shade taller than stock 265/60's. Thanks.