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Some may not patch a worn tire if: the hole is close to a previous patch; there are already more than two patches; the puncture requires more than two patches; the punctures are too close, and/or the puncture is close to the sidewall. A patch is performed by removing the tire, marking the puncture, scouring the surface to create a smooth ...
It is most often measured near the tire's centerline, although some tire makers have adopted measurement of radial run-out at three positions: left shoulder, center, and right shoulder. Some tire manufactures mark the sidewall with a red dot to indicate the location of maximal radial force and runout. [2]
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 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. [24] 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.
If the kingpin axis intersection point is outboard of the center of the contact patch, it is negative; if inside the contact patch, it is positive. The term scrub radius derives from the fact that either in the positive or negative mode, the tire does not turn on its centerline (it scrubs the road in a turn) and due to the increased friction ...