When you're considering the costs associated with the purchase of a new car, you have to think about more than just the sticker price on your Audi Q5.  If you're using your car to commute to work from the Peabody, Danvers, or Beverly areas, chances are that you've already factored in the gas mileage to approximate how much you would be spending in gas each week or month. Learn all about how to read tire size on your Audi!

At Audi Peabody, we want to assist you with some of the figures you'll need to consider when thinking about routine maintenance for your vehicle.  While the price may vary according to your area, we thought providing some basic figures could be helpful for your budgeting purposes. 


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The Tire's Type  

The first item on the above tire size is the letter "P," which tells you the tire's type. In this case, it is a P-Metric tire. This means it was made in the United States and follows all passenger vehicle guidelines. If, instead of a "P," the tire size started with an "LT," this would mean the tire is designed for a light truck. The "LT" could also appear at the end instead of the beginning of the tire size code. If the tire size had no letter at the beginning, it would be a Euro-Metric tire and could have different load capacities than the P-Metric tire.

The Width

The next part of the tire size tells us the tire's width in millimeters from sidewall to sidewall. Our example tire's size is 185.

The Aspect Ratio

The 75 after the slash marAk indicates the tire's aspect ratio, which tells us that the tire's height is 75% of its width.


The "R" means this is a radial tire. The most common tires you'll find on the road today are radials.

Wheel Diameter

The 14 that follows the "R" means this tire is designed to fit a wheel that is 14 inches in diameter.

Load Index Number

The load index number on a tire corresponds with its maximum load capacity that is listed in the load index. This means, when the tire is inflated properly, this is the most weight it is meant to accommodate. The load index number in our example tire size is 82.

Your Tire's Speed Rating

The "S" at the end of the tire size corresponds to the tire's maximum speed capability.

Additional Information

You've probably noticed other numbers, letters, and symbols on your tires apart from the above described tire size code. Here is a breakdown of that information:

  • Tire Identification Number. This number tells you the location of the manufacturing factory as well as the year and week the tire was made.
  • Air Pressure. This important number is the maximum amount of air pressure for your tire.
  • DOT Symbol. This marking tells you your tire has met Federal Motor Vehicle Safety Standards. 

Any Questions?

Instead of seemingly random markings, the information on your tire's sidewalls is actually quite important.

If you have any questions about how to read tire size or any other tire topic, we encourage our Peabody, Danvers, and Beverly neighbors to stop by Ira Audi of Peabody for a visit.

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Audi Peabody

252 Andover St
Directions Peabody, MA 01960

  • Sales: (978) 605-2293
  • Service: (978) 818-7199
  • Parts: 978-605-2181


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