Compare two tire sizes side by side — diameter, width, sidewall, and more.
Example: 215/65R16 → Width: 215, Ratio: 65, Rim: 16
Example: 225/60R17 → Width: 225, Ratio: 60, Rim: 17
Enter two tire sizes above and click Compare to see the differences.
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A tire size like 215/65R16 breaks down as: 215 = section width in millimeters, 65 = aspect ratio (sidewall height as a percentage of width), R = radial construction, 16 = rim diameter in inches. You can find your tire size on the sidewall of your current tires or in your owner's manual.
Changing your tire size affects your speedometer accuracy, ground clearance, fuel economy, and handling. This tool helps you understand exactly how a new tire size compares to your current one before you buy. A diameter difference of more than 3% can affect your speedometer reading and may interfere with your vehicle's ABS and traction control systems.