What is it for and where is it located?

The tires are a component essential of any vehicle. Despite this, also great unknowns for many of its users. Although they arouse little general interest, they are determinants for security, performance, stability and even efficiency. and his own tire can offer a lot of information about its characteristics.

One of the most important is the speed index. It is a value alphanumeric that is associated with the maximum speed that can support that particular product. They are calculated by the manufacturer based on parameters such as weight or power of the vehicles to which it is intended. Is a theoretical appreciationalways considering that the tire is in good condition, since if any type of deterioration appears, this capacity can be seen altered.

Where is the speed code located?

The speed code is part of the full registration that carry all the tires in the outer flank. May appear just after dimensions width and profile, although on other occasions it is found at the end of the description.

Of clearly identifies because, in most cases, these are letters between the L and Y, with the alphabetical order related to the speed increase maximum admitted. But they also define concepts such as the tire’s traction, handling and wear resistance. That is, the higher the letter in the alphabet, higher quality is the product… and also more expensive.

The speed code and the ITV

The speed index of tires is one of the approved parameters in any vehicle. This is so because it must to guarantee that meet the requirements benefits or performance of each model, since otherwise safety would be compromised.

Table with the speed indexes.

It is important to know that cannot be used tires with a speed code lower than indicated by the make of car for that model. can be change those of origin by others of top Index, but never the other way around.

The first reason is that could not resist the speed reached by a certain vehicle, with the consequent risk of blowout; and consequently, in the ITV will be checked and yes Any anomaly is seen in the vehicle won’t pass inspection until tires are mounted adequate.

as is possible mix brands of tires between both axles of a car, it could be done with speed codes. It is not the most recommended but it would be allowed as long as, as mentioned, the index don’t be below the minimum approved by the manufacturer.

Speed ​​code and vehicle types

Relating the performance of the tire and its speed tolerated, the different codes are generally associated with certain vehicles. It is rare to find them below the M, that is, 130 km/h.

In fact, the basic M and N They are usually used for temporary use covers, such as spare wheels. The Q corresponds to the SUV, while in most passenger cars resort to the type s and t

Above this identification, the letters V and ZR are present in cars high performance, reaching the end of them Dude, the latter corresponding to tires for sports cars capable of exceed 300 km/h.

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