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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.
For example, a 10% change in load or inflation pressure usually does not result in a 10% change in the contact patch area [3] because the load or pressure on a tire can be altered freely, and the contact patch area is affected by the tire geometry and stiffness. Further, the size of the contact patch cannot be simply calculated as load divided ...
Lateral run-out (LRO) describes the deviation of the tire's sidewall from a perfect plane. LRO can be expressed as the peak-to-peak value as well as harmonic values. LRO imparts an excitation into the vehicle in a manner similar to lateral force variation. LRO is most often measured in the upper sidewall, near the tread shoulder.
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 .
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [29] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
Whitewall tires or white sidewall (WSW) tires are tires having a stripe or entire sidewall of white rubber. These tires were most commonly used from the early 1900s ...
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A tire mobility kit is a package of equipment and accessories used for repairing vehicle tires. Hence, they are also called a tire repair kit or a tire inflator. The idea of a mobility kit is to have a small group of tools that are compact and easy to use. It benefits by taking up much less room in a trunk than even a temporary spare tire.
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