The main function of the tire tread its name implies – to protect the working surface of the tyre from damages, but not less important purpose is for ejection and removal of water from under the wheels outward, increasing the force of adhesion between tyre and wet road surface. In the case of traffic on wet roads the tread depth directly affects the likelihood of a very unpleasant and dangerous effects of hydroplaning.
To determine the degree of tread wear of the tire can be visually, without resorting to measurements. Absolutely on all your tyres, amongst the tread pattern has wear indicators, made in the form of jumpers. In operation the tire tread wears out and the jumper with time is on the same level with the tread. This is the signal that the tire is worn and its time for a change for a new one.
In addition to bridges, many tyres are equipped with wear indicators residual, representing the numbers on the tread surface made of grooves with different depths. The figure, which ceased to be visible due to the Erasure of the tread, and determine the degree of wear of the tire.
If there is a desire to measure the height of the tread, it can be done as a special tool, and ordinary ruler with depth gauge, measuring the depth of the groove of the tread. Quite widespread method of measuring the height of the tread using a coin.
The results of measurements should be compared with the reference values. For summer tires the tread depth should be 1.6 mm for winter tires, this value should not be less than 4 mm. It is at this altitude are tire wear indicators, which we have just described.
the Uneven tread wear
Another reason that you want to change the tires is uneven wear. To identify uneven tread wear use a special indicator or the instrument is the depth gauge. Measurements height tread run in 7-8 different locations on the edges of the tread and in the center.
If the edges of the tire tread is higher than in its center, the reason for this uneven wear is the excess air pressure in the tire, in the case of a long drive on half-deflated tires increased wear will be exposed to the edge of the tire, and in the center of the tire tread depth will be greater.
Uneven wear of the tread of the tire along its width, one edge of the tyre erased stronger than the other, a direct indication of a problem in the chassis — improper adjustment of camber angle.
other failure of the tire
The aging process of the tires begins immediately after their exit from the conveyor of factory, that is why the shelf life of car tires is calculated not from the beginning of their use, as from their date of issue. Even if the car is in the garage and used rarely, the aging process inevitably takes its course. The material of the tire becomes less elastic, loses its elasticity and rigidity, on the surface of the tires there are cracks.
The maximum service life of automobile tires is 10 years, however, tire manufacturers recommend changing the tires every 5-6 years.
In case of a puncture the side of the tire, damage of the bead, delamination of rubber or fabric cord, wear of the inner surface of the tire its further operation becomes unsafe, so the best thing in this case, you can do is replace the tires with new ones.
The state of the tires affects the vehicle's stability on the road and handling, so don't skimp on your own safety – be sure to replace the new tires as they wear.
Good luck to you! No nail, no wand!