When it comes to the speed symbol, engineers fight with the heat generation and heat dissipation of the tire. It would be amazing, right? So while it’s doable, you would probably need luggage to carry around the 25-pound phone. As a more relatable example, the designers of the iPhone are fully capable of designing a phone that doesn’t need a charge for a week. Actually, this battle is not only fought in tire design it also concerns any engineering component. When engineers design a tire, they are consistently in battle with tradeoff considerations. It would be ideal if all tires could be designed with a (Y)-rating, but like everything else in the tire world, it’s all about tradeoffs. Why should we have limitations on speed when we buy a tire? Why can’t all the tires be designed for (Y), regardless of usage, so consumers have peace of mind about their tires’ speed capability? These questions (and others) may have popped into your mind-or your customers’-when buying tires. It was decided to keep the letter H at speed 130 mph as an exception to manage the older tires in the market.about:blank
Tire speed rating full#
As tire technology further developed and new speed classes were introduced, the ratings table expanded to include the full alphabet. When tire speed ratings were first developed, only three existed: S, H and V. Speed lettering was first developed in the 1960s by European engineers to create a standard method of speed control and communication to consumers. Most tires using speed symbols Y and (Y) also change the size description from R to “ZR” indicating higher speed capability. Anything above 186 mph is indicated with the Y bracket “(Y)”. Tires with a speed symbol Y are capable of speeds up to 186 mph.
With the exception of letter H, as letters move from A to Z, the speed capability of the tire increases. A tire’s speed rating does not suggest the speed of the vehicle, and only shows the maximum capability of the tire. Speed ratings were established to match the speed capability of tires with the top speed of the vehicles to which they are applied. Table 1 illustrates the speed capability of tires. Table 1: Tire Speed Symbol (Courtesy of Yokohama Tire)
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