my truck was plain jane with little tires

 

Thanks ^^^ fir the monster stickers nd

 

Your speedo will be off by a percentage based on the change in diameter (diameter and circumference are directly related). For example, going from a 30" diameter tire to a 33" is a 10% increase. So, for every 10 miles your odometer goes, you actually went 11 miles (10% more). This affects your speedo the same way. If the change is 10%, when your speedo reads 30 you are going 33 and when it reads 70 you are going 77.

 

yes 10 off at 70 but if you drive at 35 its only off 5



gator beat me to it