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Bulges and depressions in the sidewall are such defects. A bulge is a weak spot in the sidewall that expands when the tire is inflated. A depression is a strong spot that does not expand in equal measure as the surrounding area. Both are deemed visual defects. Tires are measured in production to identify those with excessive visual defects.
With conventional tires, low tire pressure can be noticed due to sidewall deformation; With reinforced sidewall zero-pressure run-flat type tires, there is no warning when a tire was going flat. This low or no-pressure condition was almost impossible to detect by the driver with a zero pressure run flat, until the tire failed.
Casings with problems such as capped tread, tread separation, irreparable cuts, corroded belts or sidewall damage, or any run-flat or skidded tires, will be rejected. The mold cure method involves the application of raw rubber on the previously buffed and prepared casing, which is later cured in matrices.
UTQG ratings on sidewall of Toyo Tires Proxes R39 tire UTQG ratings (top) and tire code (bottom) on sidewall of Continental ContiProContact tire. Uniform Tire Quality Grading, commonly abbreviated as UTQG, is a set of standards for passenger car tires that measures a tire's treadwear, temperature resistance and traction.
The tires that were involved in these accidents were P235/75R15 ATX and ATX II tires and P235/75R15 and P255/70R16 Wilderness AT tires. These tires were installed as OEM equipment on the Ford Explorer, Mercury Mountaineer, Ford Bronco, Ford Ranger, Ford F-series pickup trucks, Mazda B-series pickup trucks, and Mazda Navajo between 1991 and 2000.
This heat compromises the internal structure of the tire which can lead to a blowout. When a tire is over-inflated, it wears the tread down faster, and becomes more prone to catching nails or screws in the tire. The best way to check tire maintenance is to check the air pressure, because that will lead you to whatever problem your tire might have.
The exact ratio of sidewall compliance to tread compliance is a factor in tire construction and inflation pressure. [3] Because the tire deformation tends to reach a maximum behind the center of the contact patch, by a distance known as pneumatic trail, it tends to generate a torque about a vertical axis known as self aligning torque.
Tires: Problems with a vehicle's tires may result in the unexpected loss of control of a vehicle, due to such problems as reduced traction or a sudden loss of tire pressure during operation of the vehicle. Defects in the design or manufacture of a tire may result in tire tread separation of sidewall failure, even during normal use.
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