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LT: Designates that this is a light truck tire. Load index and speed rating are sometimes not mandatory for flotation sizes, but must be for any tire approved for street and highway use. 2- or 3-digit number: Load index; see table below. 1- or 2-digit/letter combination: Speed rating; see table below. Additional marks: see subheading below.
Dedicated winter tires, also known as snow tires, are not required to have a UTQG rating. [5] Non-passenger car tires, such as those for motorcycles, buses, medium trucks and above along with trailers are also not required to have a UTQG rating, although FMVSS Standard 109 requires the following to be listed on the tire's sidewall: speed ...
They are differentiated by speed rating for different vehicles, including (starting from the lowest speed to the highest): winter tires, light truck tires, entry-level car tires, sedans and vans, sport sedans, and high-performance cars. [26] Apart from road tires, there are special categories: Snow tires are designed for use on snow and ice.
The standard test speed for tire uniformity machines is 60 r/min of a standard load wheel that approximates 5 miles per hour. High speed uniformity machines are used in research and development environments that reach 250 km/h and higher. High speed uniformity machines have also been introduced for production testing.
Results of at least three runs of each test are combined to produce the wet grip index, yielding ratings of A - G (although D and G are not used for passenger cars), where A is the best. When buying tyres, it is worth noting that the braking distance (in the wet) from the reference speed of 85 km/h, to a standstill, varies by something of the ...
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