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Tire Manufacturers and Companies Company Country Found. Brands Aeolus [1] China: 1965 Aeolus Apollo Tyres India: 1972 Apollo, [2] Apollo Tyres South Africa, [a] Bearway, [3] Kaizen, Maloya, Regal, Vredestein: Birla Tyres India: 1991 Birla Tyre [4] Belshina Belarus: 1965 Belshina [5] Bridgestone Japan: 1931
1- or 2-digit/letter combination: Speed rating; see table below. Additional marks: see subheading below. As an example, if a tire size has two sets of numbers (6-12, 5.00-15, 11.2-24), then the first number ( 5.00 -15) is the approximate width in inches, and the second number (5.00- 15 ) is the rim diameter in inches.
The upper chuck lowers to make contact with the upper bead. The tire is inflated to the set point pressure. The load wheel advances to contact the tire and apply the set loading force. The spindle drive accelerates the tire to the test speed. Once speed, force, and pressure are stable, load cells measure the force exerted on the load wheel by ...
The wet grip index (WGI) is calculated from the results of two tests specified in the regulations. The first test measures the maximum achievable average deceleration of a vehicle as it slows from 85 ± 2 km/h (52.8 mph) to 20 ± 2 km/h (12.4 mph). The second test (the "skid trailer" test) is usually performed using a tow vehicle and trailer.
1 Tire Industry History. 2 Types. Toggle Types subsection. 2.1 By construction. 2.2 By tread. 2.3 By material. 2.4 By appearance. ... Print/export Download as PDF;
These represent the tire's resistance to the generation of heat at speed. Tires graded A effectively dissipate heat up to a maximum speed that is greater than 115 mph. B rates at a maximum between 100 mph and 115 mph. C rates at a maximum of between 85 mph to 100 mph. Tires that cannot grade up to C or higher cannot be sold in the US. [9]