Questions and answers to the Maintenance and car control

pumping the tire, or letting the air out until the required air pressure in the tire is obtained.
The depth of the tire tread is checked visually, or by a depth gauge (it is also possible to use the steel
caliper used for measuring tire tread depth). Some tires have a check point on the tire tread between the
pattern. If the pattern is worn to the check point, the tire is no longer usable for driving. The depth of the
tire tread must be min 1.6 mm.
(!) What is the correct pressure of the spare tire? The spare tire must be inflated to the highest value of
the air pressure which can be used for the car.
3. Describe how to check the wheels and tires and the factors influencing their life
span.
The condition of the wheels and tires have a great influence on a safe and economical driving. Before
each travel we need to do a visual check of the condition of the tires ( depth of the tire tread is min. 1.6
mm), we regularly check and pump up the air pressure in the tires. The tire tread needs to be checked for
objects which must be removed and for wear. Irregular wear can signalize a problem with suspension and
shock absorbers, bad condition of the axle and steering geometry. We need to check the side of the tires
as any cracks may be a case of a sudden air leak. Life span of tires is mainly influenced by the following
factors:
Inflation to the pressure given by the car manufacturer
Alignment of steering geometry
Suspension and shock absorbers
Keeping the tire tread clean of any objects
Corroded wheel rims
Not well tightened nuts and wheel bolts
Balance of the wheel as a whole
Driving technique
4. What are the most frequent causes of the tire tread damage and its
manifestation.