Tire Size Calculator Plus 1.0

When considering tire purchases, it is essential to accurately compare sizes to ensure the right fit for your vehicle. Our tire size calculator simplifies this process by enabling a direct comparison of two tire sizes based on diameter, width, sidewall height, circumference, and revolutions per mile.

This tool allows users to select any two tire sizes and provides comprehensive data on their differences, alongside both metric and imperial outputs. It also features practical examples of speedometer readings with the first tire, comparing them to the actual speed if the second tire were to be installed. Visual illustrations of the two tire sizes further enhance understanding of their differences in shape and size. This resource proves invaluable for those seeking tires that deviate from stock specifications.

Understanding your tire’s sidewall is crucial:

• Tire Type: The letter "P" at the beginning of a tire size denotes a P-Metric tire, which adheres to standards set for passenger vehicles in the United States.
• No Prefix: A tire size without a letter prefix indicates a Euro Metric tire, which may possess different load capacities compared to P-Metric tires.
• LT Designation: The letters "LT" signify the tire is intended for light trucks, often requiring higher inflation pressures than standard passenger tires.
• Owner’s Manual Reference: Always consult your vehicle's owner's manual or the tire placard for recommended tire sizes and inflation pressures.

The following terms are important in understanding tire sizing:

• Tire Width: Measured in millimeters from sidewall to sidewall, this dimension is represented by the first three-digit number in a tire size. For example, in a size P220/40 R17, the width is 220 millimeters.
• Aspect Ratio: This ratio compares the tire's cross-section height to its width, indicated by the two-digit number following the slash mark. In P220/40 R17, the aspect ratio is 40%, meaning the height is 40% of the width. A higher aspect ratio results in a taller sidewall.
• Construction: The letter "R" denotes radial construction, indicating that layers within the tire run radially across its structure.
• Wheel Diameter: This measurement indicates the wheel's size, denoted from one edge to another. For instance, a P220/40 R17 tire fits a wheel with a 17-inch diameter.

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