1, according to the international GBT2978-2008 standards and requirements:
Standard tires: 2.4-2.5 bar
Reinforced tires: 2.8-2.9 bar
Maximum pressure: not more than 3.5bar
2, need to refer to other factors:
(1) Seasonal factors:
A. Winter: the standard tire pressure to the appropriate principle of 0.2bar or so.
B. Summer: according to the standard tire air pressure lower limit.
Summer car parked, air pressure generally lower than the standard about 0.1bar, so as to avoid high-temperature tire.
(2) Loading load:
A. No-load / half-load: The lower limit of the tire pressure (vehicle tire pressure on the label can be used as the minimum tire pressure reference value).
B. Full load: full load according to the upper limit of the standard tire pressure (tire tire pressure on the maximum value can be used as the theoretical reference to the maximum tire pressure).
(3) tire pressure measurement environment:
A. Hot tires: cold tire and fetal tire pressure is not the same, when the test should pay attention. The difference between the two is about 0.3 bar.
B. Cold tire: at least three hours after parking or tires driving no more than 2 km. If the tire pressure can only be measured at the time of the hot tire, subtract the measured tire pressure value by approximately 0.2 bar from the tire cooling inflation pressure.
(4) traffic conditions:
A. The larger the road surface by the appropriate standard car tire pressure adjusted tire pressure 0.1-0.2bar.
B. Smaller amplitude, can be ignored, do not care.
C. Long-distance high-speed, tire pressure can not be too low, the appropriate standard tire pressure by adjusting the tire pressure around 0.2bar.
(5) Tire condition:
A. New tires: tire pressure can be adjusted according to the standard tire air pressure around 0.2bar.
B. Old tire: the appropriate pressure by car tire pressure to reduce tire pressure, if the serious wear and tear by car tire pressure lower limit.
C. Soft tires: the comfort pattern of tires, according to the appropriate standard tire pressure increased about 0.2bar.
E. Hard tires: the manipulation of pattern tires, according to the standard tire pressure limit.
F. Differences between the brand tires: The tire pressure standard is usually the original tire, if the replacement of the tire, you need to understand (Michelin, Dunlop, Ma licensing, Marguerite, Bridgestone, Hankook, Chaoyang, etc.) between the various brands of performance differences. Such as Hantai than Michelin or Ma licensing slightly lower 0.1Bar. In the sidewall look for MAX PRESS words, the following figures such as: MAX PRESS 340kPa (50PSI), refers to the tire under normal circumstances the maximum safe inflation pressure 3.4bar.
(6) tire tire pressure:
Spare tire due to not commonly used, the pressure is preferably higher, so as to use when the air pressure is too low to lose the role of emergency. Generally should be higher than 2.5. When adjusted to the appropriate tire pressure, after inflation to high tire pressure. 2.5-3.0 bar.