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How to Read Your Tire Size to Find the Right Tire Chains

Understanding your tire size is crucial for selecting the correct tire chains, ensuring a snug fit and optimal performance in snowy or icy conditions. The tire size is displayed on the sidewall of your tire as a combination of numbers and letters. Here’s how to decode it to choose the perfect snow chains or tire chains: 

Example: 205/55R16 91H

This diagram breaks down each element of the tire size, helping you understand what the numbers and letters represent. Let’s go through them step by step:

1. Tire Type

• Indicates the type of tire, such as:
  • P: Passenger vehicle tire.
  • LT: Light truck tire.
  • T: Temporary tire (spares).
• When purchasing tire chains, ensure compatibility with your tire type.

2. Section Width (205)

• The width of the tire from sidewall to sidewall, measured in millimeters.
• This tire is 205 mm wide. Snow chains must match this width for a secure fit.

3. Aspect Ratio (55)

• The height of the tire’s sidewall as a percentage of its width.
• A ratio of 55 means the height is 55% of the width. This helps determine chain clearance.

4. Tire Construction (R)

• Indicates the tire’s internal structure.
  • R: Radial construction.
  • B: Bias-ply.
• Most tire chains are designed for radial tires.

5. Wheel Diameter (16)

• The diameter of the wheel that the tire fits, measured in inches.
• This tire fits a 16-inch wheel, and chains must match this size.

6. Load Index (91)

• A numerical value representing the maximum weight capacity of the tire.

7. Speed Rating (H)

• The maximum speed the tire can handle safely.
  • H corresponds to 130 mph (210 km/h).
• Some tire chains come with speed restrictions.

Why Tire Size Matters for Tire Chains

Selecting snow chains based on your tire size ensures a precise fit, critical for safe driving in winter conditions. A proper fit prevents slippage and reduces the risk of damage to your tires or vehicle.