Tyres what does 91h mean

As may easily be guessed, this is an indication of the maximum speed for which a given tyre has been designed. It is indicated by a letter of the alphabet, which refers to a table that is common to all manufacturers. Each letter corresponds to a certain maximum speed. It starts from letter "A", the only one which is broken down with numbers A1, A2, A3, etc.

As you might imagine, on normal cars it is difficult to find tyres with such low limits. Instructions for use: the car manual How can you find out what type of tyres can be used on your own car? In this case you are assisted by the car manual , which we know more colloquially as the "manual".

The various information presented also gives measurements which are compatible with your own vehicle, both as regards the dimensions of the wheel rim as well as tyre width and height. The general advice is always to comply with these measurements, though it is now possible to get authorisation for even more demanding sizes. It is, however, an extra procedure that requires a good deal of red tape and sometimes even a lot of expense, not to mention that compliance with the instructions ensures considerable additional safety , both for drivers and passengers.

The code on the sidewall tyre contains measurements in both inches and millimetres and, obviously, the right size of the wheels depends on the vehicles on which they must be fit. This means that the plies used for the tyres are crisscrossed. New standard tyres are built with a radial structure ; The speed rating is very important since it tells you how fast you can drive in total safety.

If a tyre has a high-speed rating, it means that the car can manage a higher speed on tread very well; Remember that the wheel diameter must be the same as the one shown in the car manual.

The tyres required very little maintenance thanks to the high quality of materials and products employed. WhatTyre wants to promote tyre knowledge in the wider car tyre market.

We think everyone should be able to find and understand their tyre size. While it is possible to use your car registration to find your tyre size, this is unreliable and could result in you spending a lot of money on the wrong size tyre. Many such searches will still ask you to identify your tyre size from a number of options anyway. We think it is better to know for sure that you are buying the correct size tyre. If we can help you with anything else, you can contact WhatTyre on any of our social media channels.

How do I find my tyre size? What do the numbers mean? Words, acronyms, numbers, letters and symbols adorn the side of each tyre. Fortunately, only a small portion of the sidewall is of any relevance when it comes to replacing a tyre. XL Denotes whether the tyre is an extra load version Date of manufacture The recommend life for a tyre is around 6 years depending on storage conditions.

The first 2 numbers in the date code refer to the week the tyre was made, and the 3rd and 4th numbers refer to the year Rotation direction If the tyre is directional this shows which way the tyre should rotate when mounted Side If the tyre is asymmetric the tyre will have 'inside' or 'outside' printed on the tyre wall, showing which way round it should be mounted on the car.

US Consumer information Treadwear, traction and temperature are rated on the side walls.