The "45" is the height from the ground to the lower edge of the wheel. It is the percentage of the width of the tread. That means it won't be quite as tall and could affect the speedometer a little. The guys at the tire store will be able to tell you the number of revolutions per mile or the outside circumference for comparison. If you have anti-lock brakes, you must buy four matching tires to keep that system happy.
Wednesday, March 30th, 2011 AT 10:30 PM