High-Performance (Speed-Rated) Tires
The so-called high-performance tire has made an increasing appearance on many new cars. Most drivers do
not care if they actually use the speed capabilities of the tire, just as long as the performance is there. In fact,
many of their cars are not capable of the speeds the tires are rated at.
The speed rating of a tire is really nothing more than an expression of how well the tire will withstand
the temperatures of high speed.
This does not necessarily mean a high-speed rated tire will perform better at low speeds than a lower rated tire.
Table 42-1 lists the various letters used to designate the speed rating of a tire and the maximum speed the tire
was designed to safely operate at.
Driving a vehicle at speeds greater than the speed rating of the tires is risky.
The heat generated can cause the tire to come apart.
If this happens at high speed, it will be close to impossible for the driver to maintain control of the vehicle.
Although high-performance tires withstand heat better than normal tires, they still wear and must be replaced.
In some European countries, the replacement tire must have, by law, the same speed rating as the OE tire.
Although it is not a law in the United States, preventing the practice of trading down in speed ratings probably
would not be a bad idea.
High-Performance (Speed-Rated) Tires
The so-called high-performance tire has made an increasing appearance on many new cars. Most drivers do
not care if they actually use the speed capabilities of the tire, just as long as the performance is there. In fact,
many of their cars are not capable of the speeds the tires are rated at.
The speed rating of a tire is really nothing more than an expression of how well the tire will withstand
the temperatures of high speed.
This does not necessarily mean a high-speed rated tire will perform better at low speeds than a lower rated tire.
Table 42-1 lists the various letters used to designate the speed rating of a tire and the maximum speed the tire
was designed to safely operate at.
Driving a vehicle at speeds greater than the speed rating of the tires is risky.
The heat generated can cause the tire to come apart.
If this happens at high speed, it will be close to impossible for the driver to maintain control of the vehicle.
Although high-performance tires withstand heat better than normal tires, they still wear and must be replaced.
In some European countries, the replacement tire must have, by law, the same speed rating as the OE tire.
Although it is not a law in the United States, preventing the practice of trading down in speed ratings probably
would not be a bad idea.
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