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Ttire Size Effect on Odometer
Posted by Dee on August 29, 2006
I just replaced the tires on my Dodge Ram. The old tire size was 285/75R16 and the new tire size is 305/70R16
Will this have a significant effect on the odometer reading, and for that matter, the speedometer?
Changing tire sizes affects the odometer and the speedometer if the tire sizes have different diameters. Since I don't know what specific tires you had on before and after. Looking up the nominal diameters for these sizes in the Tire and Rim Association book indicates that these two tire sizes have nearly the same diameter. In your case, I think the change of tire sizes will have little or no affect on the odometer or speedometer.