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2. Bar grip - Wikipedia

   en.wikipedia.org/wiki/Bar_grip

   The first deliberate uses of bar grip tyres as off-road tyres, were developed pre-war as truck tyres particularly for army use. They used crosswise tread bars for grip, arranged in a helical pattern. [4] A helical pattern was used to avoid the uneven rolling radius and vibration of a tread with simple crosswise bars and large gaps between.

3. Tire tread - Wikipedia

   en.wikipedia.org/wiki/Tire_tread

   As tires are used, the tread is worn off, limiting its effectiveness in providing traction. A worn tire can often be retreaded. The word tread is often used casually to refer to the pattern of grooves molded into the rubber, but those grooves are correctly called the tread pattern, or simply the pattern. The grooves are not the tread, they are ...

4. Tire - Wikipedia

   en.wikipedia.org/wiki/Tire

   Tire wear is a major source of rubber pollution. A concern hereby is that vehicle tire wear pollution is unregulated, unlike exhaust emissions. [102] Tire showing uneven tread wear to the point of exposing the casing Tread wear This occurs through normal contact with roads or terrain; there are several types of abnormal tread wear.

5. Tire maintenance - Wikipedia

   en.wikipedia.org/wiki/Tire_maintenance

   The chief reason for tire replacement is friction from moving contact with road surfaces, causing the tread on the outer perimeter of tires to eventually wear away. When the tread depth becomes too shallow, like for example below 3.2 mm (4/32 in), the tire is worn out and should be replaced.

6. Tire rotation - Wikipedia

   en.wikipedia.org/wiki/Tire_rotation

   Car and tire manufacturers may recommend tire rotation frequency and pattern, typically every 5,000 mi (≈8,000 km) to 8,000 mi (≈13,000 km) depending on the tire manufacturer and vehicle make [3] to ensure even tire wear. A common rotation pattern is to move the back wheels to the front, and the front to the back but crossing them when ...

7. Tire uniformity - Wikipedia

   en.wikipedia.org/wiki/Tire_uniformity

   Tire forces are divided into three axes: radial, lateral, and tangential (or fore-aft). The radial axis runs from the tire center toward the tread, and is the vertical axis running from the roadway through the tire center toward the vehicle. This axis supports the vehicle's weight. The lateral axis runs sideways across the tread.