SurayMN

Tire Size Calculator

Compare your current tire size with a new size via detailed specifications and a side-by-side visual graphic (front and side views).

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Always consult with a professional mechanic before heavily modifying your vehicle's wheel setup to ensure adequate suspension clearance and safety.

How to use

  1. 1

    Enter the details of your 'Current Tire' (e.g., Width: 225, Profile: 45, Rim: 17).

  2. 2

    Enter the details of your 'New Tire' you want to compare it with.

  3. 3

    Observe the dynamic tire graphic which displays front and side views of both tires side-by-side, with relevant dimensions labeled directly on the visual.

  4. 4

    Check the 'Comparison' section to see the exact difference in overall diameter and see how fast you will actually be going when your dashboard shows 60 km/h.

  5. 5

    Ensure the overall diameter difference is within the safe recommended range (usually under 3%).

Formula

Tire dimensions are calculated using the metric code.

Frequently asked questions

What do the numbers on my tire mean (e.g., 225/45R17)?
The first number (225) is the tire width in millimeters. The second (45) is the aspect ratio or profile (the sidewall height is 45% of the width). The 'R' stands for Radial, and the last number (17) is the wheel rim diameter in inches.
How much difference in tire size is safe?
Automotive experts generally recommend staying within a 3% difference in overall diameter. Exceeding this can cause brake failure, suspension rubbing, and incorrect ABS/traction control readings.
Why does changing tire size affect my speedometer?
Your car calculates speed based on tire rotations. A larger tire covers more distance per rotation. Therefore, if you install bigger tires, you will actually be traveling faster than what your speedometer displays.