Use your knowledge about tire labeling to fill out the following chart. Remember that 1 inch = 25.4 mm Tire Factory-Installed Tires
P265/70R17 New/Larger Rims & Tires
P285/75R18
Width (mm)
Aspect Ratio (%)
Height (in.)
Diameter (in.)
Circumference (in.)

8. After one rotation of the wheel, how many inches further has the truck with the larger tires traveled than the truck with the factory-installed tires?
2 more feet

9. After one rotation of the wheel, the truck with the larger tires has traveled times further than the truck with the factory-installed tires.

10. Use the results from the above table to calculate the following:
If the odometer reading is 100,000 miles with the larger tires, approximately what is the actual mileage?

If the speedometer reading is 70 mph, what is the actual speed?