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The Goodyear Polyglas tire was a bias-belted tire announced in 1967 by Goodyear. "Polyglas" was a registered trademark. [2] The tire combined some characteristics of both bias-ply and radial-ply tires. They had a wider tread than most other tires on the market then and used fiberglass belts.
A cross-section of a tire. Number 12 indicates the radial ply. Numbers 14 and 16 are bias plies. A radial tire (more properly, a radial-ply tire) is a particular design of vehicular tire. In this design, the cord plies are arranged at 90 degrees to the direction of travel, or radially (from the center of the tire).
[48] [49] [26] Radial tires are also seldom seen in diameters of greater than 42 inches, as such tires are difficult to make. [50] Bias tire (bias-ply, or cross-ply) construction utilizes body ply cords that extend diagonally from bead to bead, usually at angles in the range of 30 to 40 degrees from the direction of travel. [51]
An optional letter or two indicating construction of the fabric carcass of the tire: B: bias belt (where the sidewalls are the same material as the tread, leading to a rigid ride) D: diagonal; R: radial; if omitted, it is a cross-ply tire
Tire uniformity refers to the dynamic mechanical properties of pneumatic tires as strictly defined by a set of measurement standards and test conditions accepted by global tire and car makers. These standards include the parameters of radial force variation , lateral force variation , conicity, ply steer, radial run-out , lateral run-out , and ...
Because of its superiority in tread life, handling, safety from blowouts, and fuel economy, use of this technology quickly spread throughout Europe and Asia. [6] In the U.S., the bias-ply tire construction persisted, caused by tire and automobile manufacturers in America "concerned about transition costs."