For most car owners，The spare tire may be one of the least frequently used items in the car，Because of this，While doing maintenance，The inspection and maintenance of spare tires are often ignored。I don’t know，Although spare tires are not commonly used，But it often plays an important role at critical moments。

Regularly check for wear

Normally，The car owner is doing routine maintenance or before a long trip，Few car owners test spare tires，Many car owners’ spare tires are useless，Difficult to come in handy at critical moments。In fact，The spare tire plays a vital role，SeabetEspecially high-speed and long-distance driving。

Generally speaking，Inspection of spare tire，Mainly check the tire pressure and whether there are wear and cracks，Before the tread wears to the wear mark line，Replace tires as soon as possible。If there are small cracks in the sidewall，You can’t use it to run long distances or drive at high speeds，Because the tire sidewall is thin，Tire blowout is prone to occur when driving at high speed。

Tire pressure should be adjusted during use

What needs to be reminded is，The spare tire is stored to ensure its shape and use，The air pressure selection is different from common tires。General low-pressure tires are 2.0 to 2.between 5，The spare tire is 2.5 to 3.between 0。The air pressure of the spare tire is unqualified，Because the car owner does not have a pressure gauge，There is no way to adjust the air pressure，So after changing the spare tire，You should ask professionals to adjust the air pressure，Only for normal use。Generally, the spare tire pressure is set to 2.7 is safe。

Also，The spare tire should not be used in place of the regular tire for a long time，Because the spare tire is not often used，Relatively little chance of friction with the ground，After replacing the spare tire，Due to the different friction coefficients of the four tires，Different ground adhesion，Different air pressure，Prolonged use will cause damage to the vehicle’s braking system、The steering system and suspension system will have a certain impact，Brings great hidden danger to driving safety。

Should be replaced regularly

Many car owners often encounter such a situation: they want to replace the spare tire after their car has a puncture，But found that the spare tire had been left there for many years，Severely aged，Already a waste tire。This is mainly because tires are rubber products，If stored for too long, aging will occur，The aging period of general tires is about 4 years，Therefore，The spare tire should be replaced after 4 years。

simultaneously，Since the main component of tires is rubber，What rubber is most afraid of is the erosion of various oils。Car owners often store lubricants and other oil products in the trunk，Once these oils get on the tires，Can cause tire swelling，Will greatly reduce the service life of the tires。Therefore，Try not to put oil and spare tires together。If the tires are stained with oil，Use neutral detergent to rinse away oil stains in time。

Tips: How to change a spare tire?

1.Use a jack to prop up the car slightly，Before the tire is off the ground，Loosen the wheel fastening nuts。

2.After loosening the fastening nut，Continue to jack up the car，After the tire is completely off the ground，Remove the original tire。

3.Install spare tire，In diagonal order，Tighten all the fastening nuts evenly。

4.Lower the jack，This ends the tire replacement work。