National XT4000

Standards that measure treadwear, temperature resistance and traction, example: "640 A A". The 640 is the treadwear test and it lasted 6.4 times longer than the comparison tire tested against. The first "A" is the traction rating using straight-line wet traction on test surfaces (see information tables tab) and the second "A" is the temperature rating by testing operation at high speeds without heat-related failure (see information tables tab)

The side of the tire between the tread and rim, with cosmetic branding as well as information about the tire including manufacturer, model, size, etc.

An identifier of a particular tire line and size combination assigned by the tire manufacturer.

Measured in 32nds of an inch, this metric shows how much tread life is left on a tire, with the tire's traction & stopping capabilities greatly diminished at 4/32nds and less. Tire manufacturers include "tire wear bars" at 2/32nds to indicate when your tire is worn out

The measurement of width from a tires inner sidewall to the outer sidewall

The diameter of a tire that is inflated without any load applied