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What is the Formula for changing wheel size?

The formula for changing the wheel size is:

New Wheel Diameter = Original Wheel Diameter x Tire Sidewall Aspect Ratio + 2 x Original Tire Sidewall Height

where:

* New Wheel Diameter is the diameter of the new wheel in inches

* Original Wheel Diameter is the diameter of the old wheel in inches

* Tire Sidewall Aspect Ratio is the ratio of the tire's sidewall height to its width expressed in percentage

* Original Tire Sidewall Height is the height of the tire's sidewall in inches

For example, if you have a car with 16-inch wheels with tires that have a sidewall aspect ratio of 65% and a sidewall height of 2 inches, and you want to install 17-inch wheels, the new wheel diameter would be:

New Wheel Diameter = 16 inches x 0.65 + 2 x 2 inches = 18.4 inches

Therefore, you will need to install tires with a sidewall height of 1.4 inches in order to maintain the same overall wheel diameter.

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