Fuel efficiency
The rolling resistance rating that the tyre corresponds to. The higher this figure, the lower the resistance, the less fuel is spent to overcome it and the more economical the tyre is. Efficiency indices are denoted by letters of the Latin alphabet in descending order of efficiency:
A(highest efficiency),
B,
C,
D,
E,
F,
G(lowest efficiency).
With other things being equal, more economical tyres tend to cost more, but the difference is offset by fuel economy.
Noise Level
The average noise level created by a tyre while driving. The lower this indicator, the more comfortable this model will be, the less additional noise it will create.
Note that EU rules provide 3 categories of tyres in terms of noise.
“Quiet” are considered models with an index of up to 68 dB,
“medium” — 68 – 71 dB,
“loud” — 72 dB and above.
Homologation for
Recommendations of the vehicle manufacturer regarding the ideal tires for a specific car model.
Homologated tires take into account the technical and design features of machine, right down to the factory suspension settings, which helps to reveal the full potential of the "iron horse". Manufacturer-approved tires are recommended to be installed only on the wheels of suitable cars, and in some cases, without the use of homologated tires, machine risks losing its warranty. The sharpening of tires for a specific brand and model of car is indicated by specialized homologation markings.
The shelves of tire stores most often feature homologated tires for the following brands of cars:
Audi(including
Audi RS,
Alfa Romeo,
BMW / Mini,
Ferrari,
Mercedes-Benz(including
Mercedes AMG),
Maserati,
Porsche,
Tesla,
Volvo,
Volkswagen.
