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Category Archives: NAPA Service Assistant

Tires By the Numbers (What Tire Numbers Mean)

Tires By the Numbers (What Tire Numbers Mean) Dec 8th, 2024 You may have noticed your tires have a pretty long number on them.  Yours might start with a letter, then a 3-digit number, followed by a few more numbers and letters.  That string of letters and numbers is very important for your vehicle because it contains useful information on what tires will give you the performance to meet your vehicle’s original design specifications. These numbers can be found in most owners' manuals and usually on the driver's side doorframe.  Generally, it's a good idea to stick with the vehicle manufacturer's recommendations. Let's look at an example.  One customer's SUV has this number on her tires: P245/70R17 108T.  The first letter, P, means it's intended for passenger vehicles.  Some tires don't have any letter at the beginning, which means it's a metric tire. Some tires may also have LT at the beginning or end, which mea ... read more