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The Polyglas tires had a bias construction that added stabilizing circumference belts directly beneath the tread. These fiberglass belts surrounded the polyester cord body, thus the Polyglas name for which Goodyear registered a U.S. trademark #859,703. [3] The construction was a type "domestic performance car fans were familiar with". [3]
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).
Goodyear is the only one of the five biggest tire firms among US tire manufacturers in 1970 to remain independent into the 21st century. Goodyear's success was partly due to the challenge posed by radial tire technology, and the varied responses. [18] At the time, the entire US tire industry produced the older bias-ply technology. Estimates to ...
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; The R in a radial tire may be preceded by an optional letter indicating the speed rating of the tire according to a deprecated naming system.
The design was introduced by Armstrong, while Goodyear made it popular with the "Polyglas" trademark tire featuring a polyester carcass with belts of fiberglass. [57] The "belted" tire starts two main plies of polyester, rayon, or nylon annealed as in conventional tires, and then placed on top are circumferential belts at different angles that ...
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