How to judge whether the tires need to be replaced
The tire life has expired
No matter how polite the car owner usually drives, how good the road conditions are, and how good the tires are, No matter how well maintained the tires are, they will gradually age if they are used for a long time. The service life of tires is usually about 5 years. After this period, the tires will begin to age. The main manifestation of tire aging is surface hardening, followed by cracks. Aged tires will lose their elasticity, and if they are continued to be used, the tread will deform and there is a risk of puncture.
Cracks appear on the tire surface
The tires constantly rub against the ground during daily driving. If there are relatively hard and sharp debris on the road, the tires will be scratched. Some of the cracks on the surface are caused by this; there is another situation where the rubber, the main component of the tire, ages. As time goes by, it ages seriously and cracks appear, which mostly appear as dense but small cracks. Either type will increase the risk of a tire blowout accident, and the tires need to be replaced in time.
The tread pattern on the tire surface is severely worn
The surface of car tires has tread patterns. The tread patterns can increase friction and drain accumulated water smoothly through the grooves between the patterns. The tread patterns have been worn. If it is serious or even hard to see clearly, it means that it is time to replace the tire. If you continue to use it, a puncture is likely to occur.
Tread loss approaching the wear mark
Tires of any brand will have a wear mark at the bottom of the tread grooves. Generally, the height of the wear mark on car tires is 1.6 mm (this height is also the legal minimum groove depth of tires), and the height of the wear mark on truck tires is 2.4 mm.
Tire bulges
Tires have abnormal bulges in appearance, which are generally called tire bulges. The cause of their occurrence is that the wheel has been damaged or has experienced a severe accident. Bumps or impacts, such as when the wheels roll over some large potholes at high speed, may cause bulges on the surface. You should know that the rubber layer on the surface of the wheel usually has a metal mesh. A bulge indicates that the mesh in this part has been damaged and broken. If you leave it alone and continue driving, this part is likely to be damaged directly, that is, it will explode. Fetus.
Tire pressure is too high or too low
Only when the tire pressure is at the normal value, the tire can be in good working condition and will not affect the ride comfort and comfort of the vehicle. Safety will be adversely affected. If the tire pressure is too high, the tire will be very hard and its ability to absorb impact will become worse.The internal air pressure will further increase, and a tire blowout may occur. At the same time, it is not acceptable if the tire pressure is too low. If the tire deforms too much, it will also cause damage to it, so you must follow the manufacturer’s instructions to keep the tire pressure at a normal value. Many models now have built-in tire pressure monitoring or alarms. Even if there is no device, you can install one later.
Car tire replacement steps
Essential tools for tire replacement: jack, sleeve to loosen the screw cap, anti-theft screw removal head, nut protective cover removal head, warning triangle, spare parts Tires
1. Find a safe and stable place to change tires. You need a solid surface to keep the car from rolling. If you are on the side of the road, try to park as far away from oncoming traffic as possible and turn on your emergency lights (hazard lights). Avoid parking on soft ground and hills.
2. Depress the parking brake and shift the car to the “park” position. If your car has a standard transmission (manual transmission), you can adjust the gear to No. 1 or reverse.
3. Place a heavy object (such as a stone, concrete brick, spare tire, etc.) in front of the front and rear tires.
4. Take out the spare tire and jack. Place the jack under the frame near the tire you want to replace. Make sure the jack touches a metal part of the frame.
5. Raise the jack until it supports the car. The jack should be securely seated under the vehicle. Check to make sure the jack is at right angles to the ground.
6. Remove the hub cap and loosen the nut counterclockwise. Never loosen the nut completely, just enough to remove the resistance. When you first loosen the nut, keeping the tire on the ground ensures that you are turning the nut and not the tire.
7. Twitch or turn the jack to lift the tire off the ground. You need to lift it high enough to remove the flat tire and replace it with the spare. When you lift the car, make sure it is stable. If you notice any instability in your car, lower the jack and fix the problem before raising the car completely. If you find that the jack is tilted (at an angle) when it is raised, lower the jack and reposition it so that it can straighten the vehicle.
8. Completely loosen all nuts. Turn the nut counterclockwise until loose. Repeat this step for all wheel lug nuts, removing the nuts completely.
9. Remove the tire. Put the flat tire under the vehicle so that if the jack fails, the vehicle will fall on the old tire. This method can prevent damage to the car. If the jack is placed on a solid surface, you will not face any problem.
10. Put the spare tire on the wheel hub. Carefully align the spare tire rim with the wheel bolts and install the wheel lug nuts.
11. Tighten the nuts by hand until all nuts are hidden. The nut should be able to turn easily at first.
11. Lower the car slightly and do not let the tires bear all the weight of the car. Tighten the nuts as tight as possible. Lower the car completely and remove the jack. Install the hub cap after fully tightening the nuts.
12. Put the old tires intrunk, and then send it to the garage. Ask them to estimate the cost of repairs. It usually only costs a few dozen dollars to repair small holes. If the tire cannot be repaired, the garage can properly dispose of the tire and sell you a spare tire.
What are the precautions for replacing tires?
1. Choose appropriate tires. The specifications of the tires must be the same as the previous tires and must be the same as the other tires on the same axle, such as: speed level, Load index, pattern, brand, size, etc. are conducive to safe driving.
2. The valve must also be replaced. This is because when you replace the tire, the new tire and the valve have different aging cycles. During the new tire cycle, the valve may have problems, and This is not easily noticed by people, so it is best to replace the valve at the same time as changing the tire.
3. Installation direction and inflation. If you are using original car tires, they must be installed according to the manufacturer’s requirements. If they are non-original tires, usually the end with the production date is facing outward. If it is the direction For proper tires, install them so that the arrow on the wheel is in the same direction as the car’s forward direction. When inflating, the tire can be inflated to the maximum pressure allowed by the tire, and then reduced to the standard pressure specified by the manufacturer.
4. It is best to install new tires on the rear axle of the vehicle. If the tires with more wear are placed on the rear axle of the vehicle, it will reduce the drainage capacity of the rear wheels, thereby increasing the risk of driving in rainy days. So if you are only installing two new tires, they should be on the rear wheels.
5. Do not brake too sharply after replacing new tires, because the new tires have deeper treads, more tire hair, and are not fully running in with the ground. Braking too sharply will affect the braking effect of the vehicle. It is best to Do not brake too sharply within 150km after replacing new tires.
6. When removing the tire, remove the screws diagonally. Loosen the screws a little bit, and remove the screws one by one in a diagonal direction, roughly 1, 3, 4, 2. way to unload. It’s best to put the screws away after removing them so you don’t have to find them in a hurry.
7. After replacing new tires and disassembling and assembling tires, it is necessary to measure the balance. It is usually impossible to completely evenly distribute the weight of the tire after it is installed on the rim. Use a balancing machine to test the balance of the tire rim in motion, and use balance weights at unbalanced points to ensure that the tire can drive smoothly and avoid shaking.
8. It is recommended to perform a four-wheel alignment when replacing new tires. Front wheel alignment includes four items: kingpin caster angle, kingpin inclination angle, front wheel camber angle and front wheel tow. Rear wheel alignment includes wheel camber and toe-in one by one. This is also commonly referred to as four-wheel alignment. The function of wheel alignment is to keep the car running in a stable straight line and steering lightly, and to reduce the wear and tear on the tires and steering parts of the car while driving.
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