Your friendly tire dealer has a chart that will show you just what the load capacity is at a given pressure. Again, using this example, it would have the capacity of 1,755 pounds at 25 psi.

Since most tires start with about 10/32" of tread, and the legal minimum is 2/32", having those increments provides enough room to monitor wear meaningfully over time.

Above chart shows the effect off underinflation, ... since caster is primarily a directional stability setting rather than a tire wear setting (see "Alignment," November '74 HOT ROD).

For Goodyear tires, the wear bars look like tiny stair steps, marked 8, 6, 4, and 2 for 8/32 inch to 2/32 inch. Method 2: Coin test. Herreid/Getty Images.

Track Influencing Tire Wear The composition of the asphalt on this 17-turn, 3.067-mile permanent road course is coarse to begin with, and the dust from the basin near the Santa Rosa Mountains adds ...

The sensors that measure wear are also used to generate their own power via the tire's rotation. They're called Miniature Energy Harvesters, and there are multiple examples of them in the system.

“These are wear bars on a tire,” he says, pointing to a small nub in the groove of the tire tread. “They’re just little raised spots between the tread, and what those are telling you is ...

The longest-lasting tires in Consumer Reports' tests were the Pirelli P4 Four Seasons Plus. The manufacturer claims 90,000 miles, and Consumer Reports estimates they will last 100,000.