What Do the Numbers on Tires Mean?

Tire Closeup Focus on Numbers


You may have noticed all those numbers on the side of your tire. What do they all mean? If you’ve found yourself scratching your head trying to decipher each tire number meaning, you’re not alone. Our service center staff thinks that every Waco driver should understand those numbers. That’s why we’ve put together the helpful guide below. So, what do the numbers on tires mean? Find out with Douglass Nissan of Waco.



Tire Number Meaning: Size

What do the numbers on tires mean when they have a slash in the middle? These numbers are typically the largest ones on the tire, and are usually formatted like “P225/50R16” or “225/50R16”. They refer to the size of the tire. You will need to know this when buying new tires. Here’s what each of those numbers mean:

  • Letter at the beginning
  • P — Passenger vehicle
  • T — Temporary spare
  • LT — Light truck
  • ST — Special trailer service
  • Number before the “/” — This is the section width of the tire in millimeters.
  • Number right after the “/” — This is the sidewall aspect ratio (sidewall height from rim to tread)
  • Letter after the sidewall aspect ratio — indicates internal construction of the tire
  • R — Radial
  • D — Diagonal or bias ply
  • B — Belted
  • Number after the internal construction letter — rim size in inches

Tire Number Meaning: Air Pressure

What do the numbers on tires mean when they are followed by “PSI”? “PSI” stands for “Pounds per Square Inch” and refers to air pressure. However, you should not inflate your tires to this pressure. This is the maximum pressure that your tires can withstand. If you find yourself pulling into one of our Woodway gas stations because you have a low tire, consult your owner’s manual or the sticker on the inside of your driver side door for the recommended air pressure before connecting that air hose to your tire.

Let the Tire Experts at Douglass Nissan of Waco Help

If you’re confused by the numbers on the side of your tires, that’s okay! Douglass Nissan of Waco is here to help. Our trained professionals know all there is to know about your tires, how much air pressure they need, and what size to look for when they need to be replaced. So, schedule an appointment with us. We’re just a short drive away from both Hewitt and McGregor. Drop by or contact us today!


More from Douglass Nissan of Waco

  • How Many Miles Per Gallon Does the 2024 Nissan Altima Get?

      Gas prices aren’t going down anytime soon. If you want a fuel-efficient sedan, look no further than the 2024 Nissan Altima. It’s the stalwart of the brand and one of the most reliable cars in the world. You might wonder about the 2024 Nissan Altima MPG for your Woodway drives, errands, and commutes. It’s…

  • 2024 Nissan Rogue Changes: What’s New?

      The new 2024 Nissan Rogue is returning as the ultimate crossover SUV, bringing together new car advancements. Building on the success of its third generation, the next model keeps its core strengths and might even introduce the innovative Nissan e-POWER hybrid system. Let’s dive into all the 2024 Nissan Rogue changes and possible updates…

  • 2023 Nissan Kicks Interior Dimensions & Seating Capacity

      The new Kicks SUV is attractive enough to be the envy of any Waco neighborhood. But not to be outdone is the beautiful 2023 Nissan Kicks interior. Inside the 2023 Nissan Kicks, you’ll find sleek colors and cool features. The 2023 Nissan Kicks seating capacity can accommodate five passengers comfortably. Let’s take a closer…

Get Directions

5605 Legend Lake Pkwy, Waco, TX, 76712


Douglass Nissan of Waco 31.4953608, -97.1605975.