Tire Size Calculator

Understanding tire sizes is crucial for vehicle safety, performance, and compatibility. The measurements such as diameter, sidewall height, and circumference are essential for identifying the correct tire for your vehicle and for understanding how a new tire might affect vehicle dynamics.

Historical Background

Tire size notation has evolved to provide clear information about tire dimensions and characteristics. This standardization helps in ensuring that tires meet specific requirements for various vehicle types.

Calculation Formula

The sidewall height is calculated as: \[ \text{Sidewall Height (mm)} = \text{Profile Ratio} \times \text{Width (mm)} / 100 \] The tire diameter (in inches) is then: \[ \text{Tire Diameter (inches)} = \text{Wheel Diameter (inches)} + (2 \times \text{Sidewall Height (inches)}) \] The circumference of the tire can be calculated using the formula for the circumference of a circle: \[ \text{Circumference (inches)} = \pi \times \text{Tire Diameter} \] The number of revolutions per mile is found by: \[ \text{Revolutions per Mile} = 63360 / \text{Circumference} \]