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Here is a brief step-by-step explanation of how a speed rating is made: (1) Get the results of a cross country invitational (the actual race times), as deep as possible ... (if enough sequential race times are not available, it may be impossible to make a speed rating for that race).
A tire’s speed rating, also call its speed index, tells you the maximum speed a tire can safely maintain over time while carrying its maximum load (which is specified in the tire load index). It is marked using a letter from A to Z, which you can then use to look up the maximum speed in miles per hour or kilometers per hour.
A tire’s speed rating indicates the optimal speed that the tire can safely maintain over time. In short, it’s the fastest speed a tire can handle before it no longer performs as designed. The higher the speed rating, the better control and handling you’ll have at higher speeds.
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A tyre’s speed rating, also call its speed index, tells you the maximum speed a tyre can safely maintain over time while carrying its maximum load (referred to in the tyre load index table) at its manufacture specified pressure.
Speed rating is established under controlled testing where – once again, under optimal conditions – the tire is verified as capable of safely running at (up to) the indicated miles per hour.
1 Απρ 2021 · Speed ratings are the product of laboratory testing – with simulated speeds and loads. To receive any kind of rating, a tire must demonstrate that it’s capable of sustaining a particular speed. Industry standards govern the process of reaching and maintaining a given speed during a test.
