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With only radial cords, a radial tire would not be sufficiently rigid at the contact with the ground. To add further stiffness, the entire tire is surrounded by additional belts oriented closer to the direction of travel, but usually at some "spiral" angle. These belts can be made of steel (hence the term steel-belted radial), polyester, or ...
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. The Firestone 500 steel-belted radials began to show signs ...
Increased fuel efficiency and tire mileage overcame the higher price of radial construction. According to a 1976 study, more police departments used steel or fabric radial-ply tires than belted bias-ply and bias or cross-ply tires for their pursuit cars. [15] Goodyear Polyglas tires are now manufactured for owners of period cars. [16]
A further factor in Dunlop's decline was the decision during the early 1960s to develop cheaper textile radial tyres rather than the more durable steel-belted radial tyres. [1] Dunlop lost market share to manufacturers marketing steel-belted tyres, such as Michelin. [28] Meanwhile, UK productivity and quality was poor. [29]
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 improve performance compared to non-belted bias tires. The belts may be fiberglass or steel. [57]
Zinn weighs in on some quotidian questions -- like, can constantly removing and replacing a thru-axle damage the threads?
Tread separation, due to the interaction of steel and rubber tire elements, has been a challenge in radial tire design since their development by Michelin in 1946. The failure of the subject tires "begin as belt-edge separation at the edge of the second belt. This is the area of highest strain in a steel-belted radial tire, primarily due to the ...
1967: Goodyear introduces the Polyglas tire, one of the first wide-tread bias-belted fiberglass tires, which along with similar tires from competitors such as the Firestone Wide-Oval would become regular equipment on 1970 to 1974 models, which would be superseded by radial tires beginning in 1975. 1969: Sales reach $3 billion
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