Service

What Do Tire Numbers Mean?

Man Measuring Tire Tread

If you’ve ever looked at the sides of your tires, you probably noticed several numbers imprinted on them. What do these tire numbers mean? It’s important to know how to read those tire numbers so you can properly inflate your tires and know which size to choose when replacing them.  The service team at Mercedes-Benz of Tysons Corner likes to keep our customers informed so that they can keep their vehicles running in top shape. After all, no one wants to find themselves stranded somewhere in the Chantilly area with a flat tire. So, let’s answer the question, “What do the numbers on tires mean?” together!

What Do the Numbers on Tires Mean?

Tire number meaning can be broken down into two main categories: size and air pressure. Each category is identified by the letters that accompany them. So, the next time you’re wondering, “What does this tire number mean?”, check how it’s formatted.

Tire Number Meaning: Size

Numbers that indicate size are usually formatted in one of these two ways: “P225/50R16” or “225/50R16”. Here’s what those numbers on your tires mean:

  • Letter at 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

With standard tires and spare tires, you’ll enjoy the best results if all your tires are of the same size.

Tire Number Meaning: PSI

What do tire numbers mean when they’re followed by “PSI”? This is probably the most important number for the average Great Falls driver to know, since your tire technician will read the size numbers on your tires when replacing them). “PSI” stands for “Pounds per Square Inch” and refers to air pressure. You will need to know this number when inflating your tire, and you can find it in your owner’s manual if you’re not sure of what it should be.

Our Service Department in Vienna is Here to Help

The friendly service managers at our tire center will be glad to assist you with any of your tire needs, which includes making sure you get exactly the right tires for your vehicle. You can even schedule service appointments online. We’re easy to reach from Mclean or Bethesda, so don’t wait to reach out!

Ready to tackle another DIY car care task? Start by learning how to check your coolant level or change the battery in your Mercedes-Benz key.

Learn More with Mercedes-Benz of Tysons Corner

  • 2022 EQB Preview

    The 2022 EQB is a three-row luxury SUV that will make a big impact on your Mclean drives while leaving a small footprint. This all-electric SUV is an exciting addition to the lineup, so if you’re in the market for a family vehicle that takes a step in the right direction, then you’ll want to…

  • 2023 EQS SUV Preview

    Are you interested in the EQS Sedan, but wished it had more space? Meet the 2023 EQS SUV! Now, you will finally have the space for up to 7 passengers, maximum efficiency, and luxury you’ve been waiting for on your Mclean commutes. Before its release date this fall, discover the upcoming EQS SUV price, performance,…

  • 2022 Mercedes-Benz S-Class Interior

    Carefully designed and crafted with premium materials, the 2022 Mercedes-Benz S-Class interior redefines the meaning of luxury to the next level. With every detail considered, the cabin will make you feel at ease the second you step in. Enjoy a wealth of amenities from the all-LED interior lighting to thousands of stitches in the seating…

Mercedes-Benz of Tysons Corner 38.928683, -77.243223.