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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 ...
The second test (the "skid trailer" test) is usually performed using a tow vehicle and trailer. The trailer is fitted with the tyres being tested and the average maximum braking force that can be applied through the tyres, under a high proportion (60 - 90%) of the tyres' maximum load, is measured as the combination travels at a constant speed ...
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.
In Finland it is mandatory to have "winter" tires during Dec-Feb, but it is not regulated that any warning sign for lower speed rating tires is needed. —Preceding unsigned comment added by 80.81.162.66 ( talk ) 06:43, 30 October 2009 (UTC) [ reply ]
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