Why is the spare tire pressure 420?
1 Answers
The spare tire pressure is 420 because the tire pressure during storage should be higher than the standard upper limit, but it should be adjusted to match the standard tire pressure of the original tires when in use. Hazards of overinflated tires: Reduced friction and adhesion of the tires, affecting braking performance; Causes steering wheel vibration and deviation, reducing driving comfort; Accelerates localized wear of the central tread pattern, shortening tire lifespan; Increases vehicle vibration, indirectly affecting the lifespan of other components; Overstretches the tire cords, reducing elasticity and increasing the load on the vehicle during driving; Decreases puncture resistance. When encountering sharp objects like nails or glass, the tire is more prone to punctures, leading to internal cracks, blowouts, and potential tire bursts. Hazards of underinflated tires: Increases friction with the road surface, leading to higher fuel consumption; Causes heavy steering and deviation, compromising driving safety; Increases movement of tire components, leading to excessive rolling and abnormal heat generation; Weakens the function of cords and rubber, causing delamination or cord breakage, and excessive friction with the rim, damaging the bead area and causing abnormal wear; Multiplies friction with the ground, sharply raising tire temperature, softening the tire, and drastically reducing strength. High-speed driving may lead to tire bursts; Increases tire deformation, leading to sidewall cracks, flexing movements, excessive heat, rubber aging, cord fatigue, and breakage, while also enlarging the tire's contact area and accelerating shoulder wear.
