Tire Tread Depth
The tread depth is a substantial safety factor. It has an important influence on
the vehicle’s contact with the ground
Hydroplaning depends on water depth, tread depth and driving speed.
In order to measure hydroplaning, a car is driven into a basin with 8 mm water and speeds up. As soon as the motor works harder without speeding up, hydroplaning starts.
While breaking, the Anti-block Braking System is controlling the wheel at the slip threshold and water is collected. The tire tread becomes saturated and the breaking distance increases drastically. The below diagram shows breaking distance in meters and remaining speed.
A tire is made of rubber, steel and fibers. Steel and fibers are structural materials, the rubber has the function of protecting them against environmental influences. The rubber itself can be damaged by chemicals or other environmental influences.
Sharp objects, strong impacts or other mistreatment can cause visible and invisible structural defects.
Also tire pressure that is too low causes structural defects.
High temperatures and sunlight can destroy the rubber.
The tire pressure has a strong influence to the safety and economy of a vehicle.
Tire pressure when cold (never try to adjust the pressure while the tire is hot) must therefore be checked regularly (every month), especially before a long trip.
Braking distance is related to the tire pressure. At a driving speed of 100 km/h, the braking distance with correctly inflated tires will be 40 m compared to 42.4 m with deflated tires. Performance is therefore improved by almost 6%, equal to 2.4 m.
Incorrect inflation pressure causes irregular tire wear. Pressure that is too low causes shoulder wear and carries the risk of structurally damaging the tire. Pressure that is too high causes wear to the centre of the tire.
1. Daily Visual Check
All tires should have same inflation pressure.
Sidewalls should not have cracks or unusual bulges.
Check and remove any foreign object (e.g. stones or nails)
2. Monthly Tire Pressure Check
Use a proper tire gauge to measure tire pressure.
Check pressure and inflate only when the tire is cold (a hot tire will show
inaccurate reading due to inflation).
It takes around 4 hours for a tire to cool down, so it’s best to check tire
pressure either before the trip or after it cools down.
Please keep the inflation pressure, as per the vehicle tire pressure chart that
can be found on the driver’s door frame or in your owner’s handbook.
Keep the spare tire Inflated for any emergency.
3. Check for Irregular Wear
Irregular wear implies that one section of the tire is more worn than the rest.
It happens mainly because:
Tires are not uniformly inflated
Tires are not balanced
Tires are out of alignment
4. Rotate Tires Every 5,000 km
Visit a reputable tire shop or garage for tire rotation you
Check your owner’s handbook for rotating sequence
5. Check the Tread Depth Indicator
All tires come with a tread depth indicator
6. Check the Wheel Alignment
Misaligned wheels cause tires to wear more quickly and irregularly, and
prevent the vehicle from running or braking in a straight line. The suspension
and steering components will also be subjected to extra stress
It is a good idea to have your wheels aligned by a computerized alignment
machine. A reputable workshop should have the wheel alignment
specifications of your vehicle model
7. Driving Habits
Avoid over speeding, quick starts and sudden stops
Never run on wrongly inflated tires