There are radial and diagonal tires. The diagonal tire is
one in which the carcass is made with overlapping linings, passing one over the
other. In the more modern radial tire, the carcass uses wires arranged
perpendicular to the rolling plane, being directed to the center of the tire.
This way, there is no friction between the linings, reducing wear, heating and
fuel consumption, in addition to offering greater grip and flexibility.There
are also symmetrical and asymmetric types. The latter has each half of the
tread differently. In the external part, the grooves are closer to favor the
stability in this area more requested in curves. The inner side has larger
grooves to help drain the water. For this reason, this type of tire always
brings indication of sides, which must be observed when mounting on the wheel.
Finally, there is the unidirectional type, one that can only rotate in one
direction. If it is changed, it must be disassembled and reassembled on the
correct side of the wheel. See more at when should I replace my tire
What are the numbers on the side of the tire?
The tires are given three numbers to specify their characteristics. The first is the width, the second is the height - also known as profile or series - and the third is the internal diameter.
The first is measured in millimeters, while the rim is measured in inches. In the case of height, however, the number indicated on the tire is actually the percentage relationship between the height and the width of the tire section. The lower the number, the lower the tire profile and vice versa. In other words, a 175/70 R14 tire (from VW Gol) means that it is 175 mm wide, 70% in profile and 14 ”rim wheels.
There are also two other figures that indicate the Load Index (the maximum load capacity that each tire can support) and the Speed Symbol (indicates the maximum speed to which the tire can be subjected). Finally, there is an indication on the side that says Tubeless (without a camera) or Tube Type (with a camera).
How fast can a tire handle?
Depending on the number on the side of the tire, it can support a different speed limit, following the table below:
B - 50 km / h
C - 60 km / h
D - 65 km / h
E - 70 km / h
How often should I calibrate the tires?
The ideal is to calibrate the four tires every 15 days or weekly if you make severe use of the vehicle. The pressure must always follow the recommendation described in the manufacturer's manual considering the number of passengers and cargo to be transported. Always calibrate tires that are still cold, that is, after running at most five or six kilometers. As the temperature increases, the air expands, causing the pressure reading inside the tire to be incorrect. Don't forget to also calibrate the spare tire, which can receive two or three pounds of extra pressure, since in general it is not calibrated as often as the others.
What is tire caster?
The rotation of the tires consists of changing their position between the front and rear axles so that the rubber undergoes regular wear, increasing its useful life.