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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.
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] Successive plies are laid at opposing angles, forming a crisscross pattern to which the tread is applied.
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).
At the time, the entire US tire industry produced the older bias-ply technology. Estimates to fit factories with new machinery and tools for making the new product were between $600 million and $900 million. This was a substantial amount in a low margin business with sales revenue in the low billions. [18]
Coker Tire sells its own brand of bias ply and radial tires, called the Coker Classic, but it also offers a number of popular brands, such as B.F.Goodrich, Firestone, U.S. Royal, Michelin, Vredestein, Excelsior and American Classic in both bias ply and radial construction. Coker Tire is the leading source for Firestone Deluxe Champion tires, as ...
The first radial tire developed and produced by Firestone was the ill-fated Firestone 500 radial. Manufacturing of the new tire was performed on equipment designed to manufacture bias-ply tires. [41] During the 1970s, Firestone experienced major problems with the Firestone 500 radial.