Classificazione della qualità degli pneumatici

ALL PASSENGER VEHICLE TIRES MUST CONFORM TO FEDERAL SAFETY REQUIREMENTS IN ADDITION TO THESE GRADES.

Le classificazioni di qualità, ove applicabili, si trovano sul fianco dello pneumatico tra la spalla del battistrada e la larghezza massima della sezione. Ad esempio:

Treadwear 200 trazione AA temperatura A

Esempio

The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 would wear one and one half (1 ½) times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and many depart significantly from the norm due to variation in driving habits, maintenance practices and differences in road characteristics and climate.

Trazione

Le classi di trazione, dalla più alta alla più bassa, sono AA, A, B e C, misurate in condizioni controllate su superfici di prova governative specificate in asfalto e calcestruzzo. Uno pneumatico contrassegnato C può avere una scarsa trazione.

Temperatura

The temperature grades are A (the highest), B, and C, representing the tire's resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. The grade C corresponds to a minimum level of performance that all passenger vehicle tires must meet under the Federal Motor Safety Standard No. 109 Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law.