Decoding Tire Numbers: A Quick Guide to Reading Your Tire’s Code

Alternative Automotive • March 1, 2025

Have you ever looked at your tires and wondered what those numbers mean?

Understanding the numbers on your tires can help you choose the right replacements and maintain your vehicle's performance. Here’s a simple guide to help you decode the information stamped on your tires.

Common Tire Number Format

Consider a typical tire code: 205/55R16 91V. Let’s break it down:

  • 205: This is the tire’s width in millimeters.
  • 55: This is the aspect ratio, which represents the sidewall height as a percentage of the width.
  • R: This stands for radial construction, which is the most common type used in today’s vehicles.
  • 16: This is the rim diameter in inches.
  • 91: This number is the load index, indicating the maximum weight the tire can support.
  • V: This is the speed rating, showing the maximum speed at which the tire can safely operate.
Young lady struggling to read side wall details of a tire.

Why It Matters

Knowing how to read these numbers helps ensure you select the proper tires for your vehicle, which affects safety, fuel efficiency, and overall performance. If you’re ever unsure about your tire’s specifications or need a replacement, our team at Alternative Automotive is here to help.

Get Professional Tire Service

Whether you need new tires, a tire rotation, or a full inspection, we offer expert services to keep your ride safe and efficient.

Tires lined up against a cloudy sky with a bright sunset.

Schedule a service with Alternative Automotive today and let us help you stay on the road with confidence!

Understanding your tire numbers is the first step toward proper vehicle maintenance. Drive safe!

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