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Tire Size Visualizer - Online Compare & Dimensions

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Tire Size Visualizer

Online Compare & Dimensions

Please use format: 205/55R16
Please use format: 225/45R17
Units:
Dimensions
Parameter Current New Diff
Visual Comparison
Blue: Current | Red dashed: New

Frequently Asked Questions

205 is the tire width in millimeters, 55 is the aspect ratio (sidewall height is 55% of the width), and R16 stands for radial construction with a 16‑inch rim diameter.

Read as Width/Aspect Ratio + Construction + Rim Diameter. For example, 225/45R17 means width 225 mm, sidewall height is 45% of 225 mm, radial tire, 17-inch wheel.

The aspect ratio is the height of the tire’s cross‑section (sidewall) expressed as a percentage of its width. A lower profile tire (e.g., 40 series) has a shorter sidewall and typically better handling.

The speedometer calculates speed based on wheel rotations. A larger overall diameter means fewer rotations per mile, so the speedometer will read lower than your actual speed. A smaller diameter does the opposite.

Most automotive experts recommend staying within ±3% of the original overall diameter to avoid significant speedometer errors, ABS issues, and clearance problems.

It depends on the rim width. Each rim width has an approved range of tire widths. Installing a considerably wider tire may cause poor handling and uneven wear. Check your vehicle’s manual or a fitment guide.

Larger wheels usually require lower‑profile tires, which reduces the amount of air and rubber to absorb bumps. This results in a firmer, less comfortable ride, but can improve steering response.

Formula: Rim Diameter (inches) × 25.4 + 2 × (Width in mm × Aspect Ratio / 100). This gives the overall diameter in millimeters.
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