Operation Manual

5 | P a g e
On the other hand, an overinflated tire will cause accelerated wear on the center
portion of the tire resulting in uneven tire wear. It would also result in a harsher ride
and makes the tire more susceptible to damage when going over potholes or debris
on the road..
What is the optimum tire pressure? There are a lot of information about this subject
in internet forums and web articles. A quick guide for better understanding of tire
pressure below:-
1) Car manufacturers recommend the optimum tire pressure for their car
models. The information is usually available on a sticker at the door jam
(side of the driver‟s door) or in the owner‟s manual. For some car models,
the information sticker may be on the trunk lid or on the fuel door. Car
manufacturers usually recommend different tire pressure for front and rear
tires. This pressure is usually recommended for comfort driving and
optimum performance of the car. It is not advisable to go below this
recommended pressure level.
2) The car manufacturer recommended tire pressure is “cold pressure”. When
you drive your car to the gas station, the friction on the road will heat up
your car tires within a few minutes. Typically there will 1 psi (~7kPa)
increase in air pressure for every 10 deg F (5.6 deg C) rise in temperature. It
is advisable to inflate the tire pressure with this compensated pressure above
the recommended pressure.
3) Air pressure in tires is affected by changes in temperature. Check and adjust
your tire pressure whenever there is a drastic change in environment
temperature, eg. change of season.
4) A tire will normally lose its pressure through natural causes unless
accelerated by a puncture, faulty valve or damaged wheels. It is advisable to
change the tire valves or at least check the valves condition every time you
change a new set of tires. Under normal condition, a set of tires could
deflate at a rate of up to 2psi per month. It is good practice to check your tire
pressure regularly and top up to the optimum pressure.
5) Every car tire has a maximum inflation pressure. It is not advisable to inflate
to the maximum inflation pressure of the tire. Follow the car manufacturer‟s
recommended tire pressure instead.