[TKCR]

Well I found a calculator online and this is what it says. It's saying it should only be off about 5 mph. But I put in the original factory size. Is there a way of recalibrating our speedos?


Tire Size and Conversion Calculator

Original Factory size 235/75/15
New size 265/65/18

Original. New Difference
Sidewall Height: 6.94'' 6.78'' -0.16''
Section Width: 9.25'' 10.43'' 1.18''
Tire Height: 28.88'' 31.56'' 2.68''
Tire Circum: 90.73'' 99.15'' 8.42''
Rev. / Mile: 698.34 639.03 -59.31

If your speedometer reads 55, you are going about 60.1mph
If your speedometer reads 60, you are going about 65.6mph