The 10.50 inches is the tire's advertised width, usually taken at the tread, not the sidewall bulge. And the 15 is the size of the wheel it's designed for. So, in this case you've got a 31-inch ...

Using 235/55R18 as an example, 235 is the tread width in millimeters. The higher that first number, the wider the tire. The 55 is the height of the tire expressed as a percentage of the width we ...

Few car maintenance tasks are as crucial (or as often overlooked) as tire tread depth. It's a major part of determining how safe, effective, and long-lasting your tires are, and yet it's rarely ...

Tread depth varies according to size, but ranges from 18/32 to ... Ride quality is great and, using the load inflation chart, we found a perfect tire pressure. We only have one complaint: Noise.

Finally, there is no direct correlation between section width and tread width (the actual tire ground contact patch). Tires with identical section widths may have slightly different tread widths.

So, the U.S. Department of Transportation got to set the original nomenclature for tires. That's why, until the 1960s, the wheel size was in inches, the tread width was in inches and there was no ...