From the grain point of view, inferior retreaded tires usually make the tire color particularly bright because of irregular processing and shallow grain grooves, while regular and good quality new tires do not.

2. Pay attention to the tire identification.

Generally, the sign of retreaded tires is re-affixed. Scraping these signs with your nails can deduct poor quality tires that will be refurbished. Or a small triangle will be printed on the outside of the tire. Generally, reaching this mark means that the tires are seriously worn and should be scrapped. The poor quality or refurbished inferior tire logo is posted by the workshop itself and can be removed by hand.

185/70R 14c 86H

185: tread width (mm)

70: Average ratio (fetal height/fetal width) (70 refers to 70%)

Meridian structure

14: diameter of steel ring (inch)

C: It means aggravating the fetus.

86: load index (indicating that the corresponding maximum load is 530 kg)

H: speed code (indicating that the maximum safe speed is 2 10 km/h)

3. Observe the shelf life of tires.

Generally, the production date of tires will be printed on the tire sidewall near the hub, and the production date is represented by four numbers. The first two digits of these four numbers indicate the week of tire production, and the last two digits indicate the year of tire production. For example, 47 14 is the 47th week of 20 14. Therefore, it is necessary to avoid producing tires that have been stored for too long.

Extended data:

The structure of tire is divided into three parts: carcass, cord fabric and tread.

1, the carcass is soft, the tread is hard, the middle cord plays a role in strengthening the strength and setting of the carcass, and more metal wires are added to improve the elastic properties of the tire.

2. Automobile tires are roughly divided into radial tires and bias tires. The cords of oblique tires are arranged diagonally, hence the name. The carcass constitutes the basic skeleton of the tire, and the softness from the outer tread to the sidewall is consistent.

The main functions are:

1, supporting the total weight of the vehicle, bearing the load of the vehicle and transmitting the force and torque in other directions;

2. Transfer the torque of traction and braking to ensure the good adhesion between the wheel and the road surface, thus improving the power, braking and passability of the automobile; Together with the automobile suspension, it can reduce the impact of automobile running and attenuate the vibration caused by it.

Baidu encyclopedia-tire