Guangzhou automotive maintenance training school -- nine point care for periodic tyre inspection
The weather is getting hotter and the temperature is getting warmer, and the safety of car tyres is very important in day-to-day travel, with constant attention to the condition of tyres. If anything happens, it matters. Are your tyres safe? Are regular checks conducted regularly? These should be noted。
As indicated above, the basic information on a tyre is all shown above, and we have a question-and-answer session on the relevant information on tyres。
Q: is the term " tyre specification " complicated?
There are currently four specification systems for passenger tyres: p, e, mm, alphanumeric. In the united states, the p system is more widely used. If your tyre side print specification is p215/65r95s (the number may change), then your tyre is p-made. P for car tyres, 215 for the “cross-section width” of tyres - length at wider range - unit millimetres, 65 for the high-wideness ratio of tyres “” - i. E., the cross-section height and the percentage of cross-section width, and r for the midday line structure. 15 is rounded in diameter, in inches, and 95s is instruction (95 is a load index - from a higher load capacity table - in kg, s represents velocity class). This is only one system of specifications and three others。
Q: what is the speed level of tyres?
Response: formally, speed levels indicate a higher rate of carrying of the required loads of tyres under specified conditions. Letters a to z represent the rate of certification of tyres from 4. 8 km/h to 300 km/h. Common speed levels are:
P150 km/h h210 km/h q160 km/h v240 km/h
R170 km/h w270 km/h s180 km/h y300 km/h
T190 km/h zr above 240 km/h
Zrs appear using the specifications for tyres in the instructions. For example, p275/40zr1793w, the higher speed level ( "w" in "93w") is 270 km/h. In the more recent provisions for the standardization of tyre markings, velocity symbols and load factors are included in the instructions for the use of all levels except the non-radical z velocity level. For example, p225/60r1595h is a description of the use of tyres, indicating a larger capacity of 690 kg and a higher rate of 210 km/h。
Q: does the temperature grade on tyres matter?
It is important that it represents properly maintained tyre dispersive capacity and under controlled indoor test wheel conditions. Tyres are classified as “c” if they meet the lower performance conditions set by the united states department of transport (dot). Levels “b” and “a” indicate that tyres are above the lower performance required by dot. All tyres are required to meet the lower speed requirement of 136mkph set out in federal motor vehicle safety standard 109。
Q: what are the european or mm specifications
Response: the system is essentially a replica of the original (now obsolete) digital specification system (from inches to mm). If your tyre side print specification is 185/70 r1488s (specific numbers may vary), then your tyre is european. 185s is the cross-section width of tyres in millimeters and 70 is the high width ratio. 14 is the rim diameter, inches, and 88s is the description of use (load index factor and velocity level). R is the meridian structure. If you have a tyre specification of 240/55r390 then it's a millimetre. In this example 240 indicates cross-section width, millimetres in millimetres, 55 is a high width ratio, r is a meridian structure, 390 represents a rim diameter, millimetres in millimetres。
Question: my tire towed is a. What does that mean?
In short, it represents the parking capacity of tyres on the wet, straight-line test road. For example, level aa tyres park faster than level c tyres on a wet straight line. It is noteworthy that the towed gravity test was carried out in the concrete asphalt test site* maintained, where the specific humidity simulated the vast majority of road surfaces. The test does not measure the brake performance on the dry surface or the sharp turn pull of gravity under any other condition. Gravity levels are aa, a, b, c, of which aa is higher。
The car's four wheels. Including spare tyres. Regular monthly inspections are mandatory. Check it out. At the same time, it is necessary to observe whether there are cracks or cuts on the surface of tyres. It is also better to put gloves on the inside of the tyre to check for suspicious traces. Whenever there is any suspicion, the car must be inspected in detail. You don't have to throw out a sick tire. In the event of an abnormal wear on the tyre surface, it should be thought that there may be a problem with the front-column correction of the wheel and that it should be repaired。
1. Exterior edge wear
The reason for this is that, when observed in the direction of the journey, there is considerable wear on the outer edge of the tyre, indicating that the tyre is often in an inflatable state, i. E. Under pressure。
Solutions examined tire pressure several times. If possible, press the "highway" standard, i. E. 30,000 more than normal. Moreover, it is generally thought that, since the inflated tyres are not conducive to snow and sand, they can also be found in the wet tides. It is important to know that under-inflated tyres are very damaging to the rainy days and that the capture of ground is significantly reduced。
2. Coms and bellow wear
The reason for this is that, if both sides of the tyre were found to be in condensed wear on both sides of the ground, and if the tyre was also in the periphery, it would indicate that the parts of the vehicle, such as the shocker, the bearing and the spherical axle, were to be worn more severely。
The solution is that, because of the high cost of replacing new tyres, you are advised to check the wear and tear of the hanging system before replacing tyres. Otherwise, even the replacement of tyres would not help。
3. Surface evenly worn
The cause of the flat wear of tyres is normal. All of its ministries will be performing accordingly. Once the tattoos have dried. Indicates that tyres have reached their end of life. It must be replaced, in addition to the gratuity of the area of the detachment, which is therefore an important element in maintaining the physical nature of the vehicle. The solution must not be to manufacture tires of its own accord. If the wear reaches the standard depth of the tyre graft (usually 2 mm for tyres with a width greater than 175 mm) it is replaced. Of course, the degree of wear and tear varies. But know. The difference in wear and tear between tyres on the same axle shall not exceed 5 mm。
4. “direct injuries” within tyres result from severe scratches on the rubber layer of the tyre following a collision between the vehicle and the hard object (e. G. On the side of the tunnel) or when it moves under the foetal state. The solution is in this case. Tyres leak and break. If the creation is smaller, it can certainly be repaired to meet the demands of the hour, but it must be replaced immediately if it is to travel long distances。
5. Reasons for partial wear and tear at the centre
If severe wear occurs in the centre area of the area where tyres are found, this suggests that tyres are often over-inflated. This is also detrimental to the maintenance of tyres and has accelerated their wear. The solution must first check whether the pressure sheet is adjusted or not. It must be known that only on high-speed or reloading. It is necessary to over-inflate tyres, but not in a general state。
6. Tire side cracks
This is due to poor maintenance. Or on the surface of multiple stones and on construction sites, so hard objects are exposed to tyres, causing damage to the inner layer of tyres under heavy pressure。
Solutions require immediate action, such as less costly repairs. It is better to fix it or to replace it. While new technologies have been applied, tyres are now more eccentric and need to be properly maintained. Guangzhou automobile maintenance training school
7. Causes of drumming of tyres
Tires appear on the side. This is because there are cracks in the inner part of the tyre, causing the gas to reach the surface through cracks, which eventually lead to the tyre being "gunned". The solution should not be to assume that it is not sustainable to fix things and to patch rubber. In particular, long-distance driving makes it easier to replace tyres in a timely manner。
8. Causes of internal wear and tear of tyres
The inside side of the tyre is worn, and the outer edges are strangulated. It is common for some old vehicles to have poor hang-up systems, which plunges the entire vehicle. This indicates that tyre deformation and the symmetry of two tyres are affected. The solution would be to replace all fittings, such as shock-mitigators, spherical axes, etc., better if conditions were met. However, if the costs are too high, the perspective of having a professional repairer handle the pre-school bridge and tyre may be considered。
Causes of local wear and tear of tyres
If there is only one large area of wear on the surface of the tyre, this means that the wheel is not occupied during the emergency brake, and if there are two identical wears on the front and back wheels, this means that the drum brake is in question. The solution would in any event have to replace tyres in this case. In order to cope with emergencies, used tyres can of course be temporarily replaced in the back wheel to increase safety。
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