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  2. Tire code - Wikipedia

    en.wikipedia.org/wiki/Tire_code

    Starting in 1972 tires were specified by load rating, using a letter code. In practice, a higher load rating tire was also a wider tire. In this system a tire had a letter, optionally followed by "R" for radial tires, followed by the aspect ratio, a dash and the diameter – C78-15 or CR78-15 for bias and radial, respectively. Each diameter of ...

  3. Uniform Tire Quality Grading - Wikipedia

    en.wikipedia.org/wiki/Uniform_Tire_Quality_Grading

    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 restriction if less than 55 mph, regroovable if designed for regrooving, and a letter designating ...

  4. Tire sizes and ratings: What do letters and numbers mean?

    www.aol.com/news/tire-sizes-ratings-letters...

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  5. Tyre label - Wikipedia

    en.wikipedia.org/wiki/Tyre_label

    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 ...

  6. Talk:Tire code - Wikipedia

    en.wikipedia.org/wiki/Talk:Tire_code

    If you are still alive ;-) the letter is the speed code -- the number is the load rating. You had best not use tires of a lower load rating unless you look up the max load in pounds for your current tire at current PSI, and see what PSI is needed for the lower load rating tire to carry the same load. You likely have to raise the PSI.

  7. Tire uniformity - Wikipedia

    en.wikipedia.org/wiki/Tire_uniformity

    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.

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