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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 ...
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.
Design of tire tread has an effect upon noise generated, especially at freeway speeds. [1] Generally there is a tradeoff of tread friction capability; deeper patterns often enhance safety, but simpler designs are less costly to produce and actually may afford some roadway noise mitigation .
This is similar to other forensic evidence such as bite mark analysis, tire tread analysis, etc. where there is little scientific evidence of its efficacy. In 2009, the National Academy of Sciences made the conclusion that, aside from DNA, there was little if not any, scientific evidence for many forensic disciplines, including footprint evidence.
However 'P' denotes P metric size load and speed rating changes for P tire & non-P tires; 195 – the nominal width of the tire is approximately 195 mm at the widest point; 55 – indicates that the height of the sidewall of the tire is 55% of the width (107 mm) R – this is a radial tire; 16 – this tire fits 16 in (410 mm) rims
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").
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.
A typical example of a tire marking according to ISO 5775-1 is: 32-597 inflate to 400 kPa. The first number (nominal section width) is essentially the width of the inflated tire (minus any tread). The second number (nominal rim diameter) is the inner diameter of the tire when it is mounted on the rim.