How to Read and Understand Your Tire Size: A Simple Guide

Learn how to read tire size markings on your vehicle's tire sidewall with this easy-to-follow guide and understand what each number and letter means.

180 views

To find your tire size, look for a series of numbers and letters on your tire's sidewall. It typically starts with a letter (P for passenger vehicle tires, LT for light truck tires) followed by three numbers (tire width in millimeters), a slash, two numbers (aspect ratio as a percent), and finally, a letter with two numbers (R for radial, followed by the diameter of the wheel in inches). Example: P215/65R15.

FAQs & Answers

  1. What does the 'P' in tire size stand for? The 'P' indicates the tire is designed for a passenger vehicle.
  2. How can I find my tire’s width from the sidewall numbers? The tire width is the three-digit number following the initial letter, representing the width in millimeters, such as 215 in P215/65R15.
  3. What does the aspect ratio number in tire size mean? The aspect ratio is the two-digit number after the slash that shows the tire's height as a percentage of its width.
  4. What does 'R' mean in tire size like P215/65R15? The 'R' means the tire uses radial construction, which is common in modern tires.

Watch More

For more helpful automotive tips, check out our videos on choosing the right tires for your vehicle and how to maintain tire pressure for optimal performance and safety.

  1. How to Find Your Tire Size Using the Numbers on the Sidewall Learn how to identify your tire size from the sidewall code like P215/65R15. Get tips for proper tire selection and vehicle compatibility.
  2. How Are Tire Sizes Specified? Understanding Tire Width, Aspect Ratio & Diameter Learn how tire sizes are specified using width, aspect ratio, and diameter to choose the right tires for your vehicle.
  3. What Do Tire Sizes Mean? Understanding Tire Size Codes Explained Learn what tire size numbers mean, including width, aspect ratio, radial type, and wheel diameter to choose the right tires for your vehicle.
  4. What Do Light Truck Tire Sizes Mean? Understanding LT Tire Dimensions Explained Learn how to read light truck tire sizes like LT235/75R15 and what each number means for your vehicle's performance and safety.
  5. How to Read LT Tire Sizes: A Simple Guide to Understanding Tire Codes Learn how to read LT tire sizes like LT235/85R16 with this easy guide. Understand tire width, aspect ratio, type, and rim diameter for the right fit.
  6. What Do the 3 Numbers on Tire Size Mean? Explained Simply Learn what the 3 numbers on tire size represent: width in mm, aspect ratio, and wheel diameter in inches for proper vehicle fit and performance.
  7. What Size Are Tires in Inches? Understanding Tire Size Measurements Learn how to read tire sizes in inches, including width, aspect ratio, and wheel diameter for proper tire selection.
  8. How to Read Tyre Sizes: Decoding Tyre Size Numbers Explained Learn how to read tyre sizes like 205/55 R16 91V by understanding tread width, aspect ratio, rim diameter, load index, and speed rating.
  9. How to Read a 4x4 Tyre Size: Understanding Tyre Numbers Explained Learn how to read a 4x4 tyre size like 265/70R16 by decoding tyre width, aspect ratio, construction, and wheel diameter for the right fit.
  10. Which Tire is Wider: 55 or 65 Aspect Ratio Explained Learn whether a 55 or 65 tire aspect ratio means a wider tire and how to correctly interpret tire width specifications.
  11. What Is the Difference Between 225/65/17 and 225/55/17 Tire Sizes? Learn how 225/65/17 and 225/55/17 tire sizes differ in width, aspect ratio, and wheel diameter for better vehicle performance.
  12. What Does 285 Mean on a Tire? Understanding Tire Sizes Explained Learn what the number 285 means on a tire, including how tire widths and codes affect fitment and vehicle performance.
  13. Determining Tire Height: 235 vs 245 Explained Learn the height differences between 235 and 245 tires and how to measure them accurately by understanding tire specifications.
  14. Which Tire Size is Bigger: 215 or 245? Learn how tire sizes affect performance and safety. Discover the differences between 215 and 245 tires.
  15. What Tire Size Is Equivalent to 235? Understanding Tire Width and Compatibility Learn how to find an equivalent tire size to 235 width by matching diameter and aspect ratio for safe tire replacement.