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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 National Tyre Distributors Association (NTDA). [1] is a trade association based in the United Kingdom. It was created in 1930 and represents tyre wholesalers, retailers, mobile tyre fitters and fast fit companies across the UK. It also has supplier members that include leading tyre manufacturers, retreaders, repairers and end of life tyre ...
For passenger and light truck tyres, the manufacturers or importers have the choice of either putting a sticker on the tyre tread or a label accompanying each delivery of batch of tyres to the dealer and to the end consumer. The tyre label will use a classification from the best (green category "A") to the worst performance (red category "G").
In many prefectures, tread grooves of snow tires are worn off for more than 50% of their original depth, tires must be replaced to meet the legal requirements. [14] Drivers will be fined for failing to comply with the snow tire or tire chains requirements, and checkpoints are in place on major highways.
Tire forces are divided into three axes: radial, lateral, and tangential (or fore-aft). The radial axis runs from the tire center toward the tread, and is the vertical axis running from the roadway through the tire center toward the vehicle. This axis supports the vehicle's weight. The lateral axis runs sideways across the tread.
To take a common example, 195/55R16 would mean that the nominal width of the tire is approximately 195 mm at the widest point, the height of the side-wall of the tire is 55% of the width (107 mm in this example) and that the tire fits 16-inch-diameter (410 mm) rims. The code gives a direct calculation of the theoretical diameter of the tire.
Grooved tyres are designed to remove water from the contact area through the grooves, thereby maintaining traction even in wet conditions. Since there is no tread pattern, slick tyre tread does not deform much under load. The reduced deformation allows the tyre to be constructed of softer compounds without excessive overheating and blistering.
The overall circumference of the tire will increase by increasing any of the tire's specifications. For example, increasing the width of the tire will also increase its circumference, because the sidewall height is a proportional dimension. Increasing the aspect ratio will increase the height of the tire and hence the circumference.