The time of year for which the tyre is designed. In fact, we are talking about the regular temperature mode of operation. In truck tyres there are such options:
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All season. Tyres that do not have a pronounced specialization and are suitable for use at any time of the year. Note that the specific resistance to cold and heat can be different, and not every of these models is suitable for driving in severe frost or heat. This point must be clarified according to the manufacturer's documentation. At the same time, this option is convenient in that with all-weather tyres correctly selected for the climate, the owner does not have to “change shoes” for the car when the seasons change. However such tyres in frosty or hot weather will be inferior in performance to specialized winter or
summer truck tyres ; however, at less extreme temperatures, this difference is almost imperceptible.
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Winter. Tyres intended for use in the cold season — usually at an average daily air temperature of less than +5 °C (however, specific recommendations from the manufacturer may vary). They are made of softer material than all-weather ones, thanks to which they retain the necessary softness even in severe frosts. In addition, various solutions can be used in the design to improve grip and increase stability on snow or ice. It makes sense to pay attention to such tyres for those
...who plan to drive frequently in winter, including in severe frosts: in such conditions, winter tyres definitely outperform all-season tyres in terms of performance.
— Summer. Tyres designed for operation only in the warm season. The standard limit for such rubber is the average daily temperature of at least +5 °C, however, manufacturers may provide other minimum temperatures, so you should carefully read the documents before use. Anyway, in the summer, such tyres are superior in performance to all-season tyres, but this difference becomes noticeable only in hot weather. Therefore, you should pay attention to this option first of all if you plan to intensively operate trucks in the heat — especially since there are very few summer tyres.The load index characterizes the maximum weight under which the tyre can be safely operated. As in the case of the speed rating described above, this indicator cannot be exceeded, otherwise unpleasant consequences are possible, up to accidents. Also note that when selecting according to the load index, it is worth considering the distribution of weight along different axes of the vehicle. And it is worth considering the maximum possible weight when the truck is loaded, in accordance with what to select
truck tyres for heavy loads.
The speed rating describes the maximum speed at which a given tyre can be safely driven. It is worth choosing a model according to this parameter in such a way that during operation it is not allowed to exceed the speed rating — this creates increased loads on the tyre and can lead to its damage (up to an “explosion”). And it is best to choose an option with a margin of at least 10 – 15 km/h — this will give an additional guarantee in case of emergency situations. For truck tyres, speed indices in the range of 100 – 130 km/h are considered popular, and these are
the J speed rating(100 km/h),
the K speed rating(110 km/h),
the L speed rating(120 km/h) and
the speed rating M(130 km/h). For agricultural machinery, the speed is much lower:
index A6(30 km/h),
index A8(40 km/h),
index B(50 km/h),
index D(65 km/h),
index F(80 km/h) ). There are also
high-speed truck tyres and less popular
speed indices C(60 km/h),
E (70 km/h) and
G (90 km/h).
