Guide for proper usage of tires
The following points are recommended for longer life and better function of your tires, and for preventing probable events:
Fitting the tire properly
⦁ Make sure rim and tire are matched in size
⦁ Since scratching or bending of rim due to shock should be prevented. For easy fitting never use oily lubricants, but you may use water and soap specially in fitting tubeless radial tires. Applying hammer to take out or fit the tire will damage the tire bead and rim.
⦁ Damaging tire bead due to wrong fitting of tire on the rim may causes air to be penetrated into tire plys causing ply separation and the body to be bulged. To prevent this default, great care should be taken during fitting the tire not to damage tire bead.
⦁ Rim balance is very important. To gain a reasonable balance, the heaviest part of the tire should be placed beside the lightest part of the rim. Unbalanced tires affect the motion quality and decrease tire life time.
Proper selection and fitting of tube and flipper
If the car has tubed tires, the following points should be notices:
⦁ Tube and flipper dimensions should match tire and rim. An outworn tube or an improper flipper may create sever troubles for tire. Since the proper function of tube depends on its valve proper efficiency, a tube which has been used for a while is not as efficient as a new one even in the appearance is fully sound. Therefore, new tube and flipper should be used when fitting a new retreaded or non-retreaded tire
⦁ Before placing the tube inside the tire, make sure the tube and the tire inside are fully dry and clean. Clean the tube surface softly and apply talk powder on its surface. Never pour talk powder inside the tire
⦁ Any damage to tube leads to tire damage.In the following states, tube may also be damaged by flipper
⦁ When the flipper width is not proper with tire size and rim width
⦁ When a worn-out or damaged flipper is re-used
⦁ When flipper edges are bitten by rim during fitting and mounting the tire
As mentioned above, before mounting the tire on the rim, make sure that flipper edges are properly laied on the flat internal surface without any shrinkage.In the following cases may lead to tube biting
⦁ Ignorance and incapability in fitting the tire on the rim
⦁ Improper fitting of the tire (in view of its center) in a ducted rim (with a cavity in the middle of the rim) in truck tires
⦁ Not using flipper in multi-piece rims Proper setting of tire air pressure
Drivers should follow the recommended air pressure by car manufacturing factories. The recommendations are stamped on the car door edge or dashboard as a label or are presented to the car owner as an instruction manual.
Adjustment of tire air pressure is very significant in both its duration, function and preventing of tire-related accidents, proper air pressure cause less fuel consumption. Therefore, the following points should be considered:
a) Tire air should always be set in cold status (20-25°C ambient temperature) and before car movement
b) Use a proper pressure gauge, preferably a new one.
c) If the tire is warm (temperature is high or the car has run over 20km) avoid deflating extra air of the tire.
d) Tire air pressure should be always set in accordance with car load. When the load is full, the tire air pressure should be set at its maximum standard in cold state, and the carving on the tire sidewall should be noticed. The following figure shows the effect of air pressure on the contact of tire rib surface with roads and its uneven abrasion.Load distribution effect on the tire function
Controlling imposed load on tires and preventing extra pressure on some of them through proper loading is very important. If the car load isn’t placed in the middle of load shield, the imposed load becomes more in one side than the other side particularly causes impose of huge load on the tires of one side on the road curves, this incur damages on the tires.