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A severe flat spot on a rail wheel. A flat spot, or wheel flat, also called spalling or shelling, is a fault in railroad wheel shape. A flat spot occurs when a rail vehicle's wheelset stops rotating while the train is still in motion, causing part of the wheel to ablate against the hard steel of the rails.
Avoid construction areas: You might be more likely to get a flat tire when driving through a construction area, as nails, metal, staples and other sharp objects can get left on the road and ...
The most common cause of a flat tire is the puncturing of the tire by a sharp object, such as a nail or pin, letting the air escape. Depending on the size of the blowout, the tire may deflate slowly or rapidly. [1] A flat tire in a busy district in Lagos, Nigeria. A vehicle with a flat tire can cause local delays in traffic.
Underinflation leads to premature wear on the sides of the tire and creates excess flex in the sidewalls, which generates potentially dangerous heat that can lead to blowouts and other tire failures.
Severe braking or low adhesion may stop the rotation of the wheels while the vehicle is still moving can cause a flat spot on the tire and localized heat damage to the tire material. Tires are reasonably thick, about 3 inches (76 mm), giving plenty of room for wear.
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Vehicles typically carry a spare tire, already mounted on a wheel rim, to be used in the event of a flat tire or blowout.Spare tires (sometimes called "doughnuts") for modern cars are smaller than regular tires (to save trunk space, weight and cost) and should not be used to drive very far before replacement with a full-size tire.
Vents to release gas have not been found on railway, aircraft and passenger car brakes because there is no gas to vent. Meanwhile, heavy trucks still use drum brakes because they take up the same space. Railways have never used internal expanding drum brakes because they cause skidding, causing expensive flat spots on steel wheels.
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