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A Tire Size Calculator helps you decode the numbers on your tire's sidewall (like 265/70R17) to find its actual physical dimensions. It's an essential tool for understanding how different tire sizes compare, ensuring they will fit your vehicle without causing issues.

Whether you're upgrading your wheels, considering a different tire size for performance or comfort, or just curious, this calculator makes it easy to understand and compare tire specifications.

The numbers on your tire's sidewall represent specific measurements. For a tire labeled 265/70R17, here's what each part means:

• 265 (Width): The first number is the tire's width in millimeters, measured from sidewall to sidewall. A wider tire can provide more grip but may affect fuel efficiency.
• 70 (Aspect Ratio): The second number is the aspect ratio, which is the sidewall height as a percentage of the tire's width. A lower number means a shorter sidewall (common on sports cars for better handling), while a higher number means a taller sidewall (common on trucks for a smoother ride).
• 17 (Diameter): The last number is the diameter of the wheel (or rim) in inches that the tire is designed to fit. You must match this number to your vehicle's wheels.

The calculator uses these values to determine the tire's overall height (diameter), sidewall height, circumference, and how many times it will rotate per mile or kilometer.

Choosing the correct tire size is crucial for your vehicle's safety, performance, and speedometer accuracy. A tire that is too large can rub against the vehicle's body or suspension, especially when turning. A tire that is too small can affect gearing, reduce ride comfort, and alter the vehicle's handling characteristics. Using a comparison tool ensures that any new tire size is within an acceptable range (typically +/- 3%) of the original factory size.