Why do high speed tires on cars have bumps and patterns?

Causes of total tire breakage:

1.The tire pressure is too high.

When the tire is used under high air pressure, the contact area between the tire and the road surface becomes smaller, and the pressure increases, which accelerates the wear of the middle of the tread; When the tire pressure is too high, the stress of the carcass increases, so that the cord layer is subjected to excessive tensile strength decreases, the elasticity is reduced, it is easy to be punctured by sharp objects, and the carcass may also burst when it is subjected to a large impact. In addition, high tire pressure will also reduce the grip of the tire, resulting in longer braking distance; Affects comfort and exacerbates wear and tear on chassis components.

2.Tire pressure is too low.

Tire pressure that is too low can cause more serious damage to the tire. This is mainly due to the increase of sidewall deformation, so that the cord layer in the carcass produces excessive alternating stress, periodic compression deformation will accelerate the fatigue damage of the cord, at first the rubber line is detached, and then it will be quickly broken, so that the tire is scrapped prematurely; When the tire rolls at low air pressure, it will aggravate the heat generation temperature of the tire, and when the tire temperature is too high, it will also lead to local delamination of the carcass A, friction between the cords, and the temperature at the place of delamination.

Higher, it is also more likely to cause sidewall bursting; When the tire pressure is low, the middle load of the tread becomes smaller, and the edge load increases, causing the shoulder pattern to be severely worn. Low tire pressure not only increases tire wear, but also increases rolling resistance and increases fuel consumption.

3.Overloaded tires.

The characteristics of tire damage during overloading are similar to those when driving at low air pressure, but the wear and damage to tires from overloading is more severe. Due to the large deformation of the tire, the stress on the sidewall is too large, so that the fatigue of the tire material and its strength are reduced faster, and the cord layer is most likely to break or burst on the sidewall; When an overloaded tire rolls into a stone, a crown burst often occurs. Practice has shown that with a 20% overload, tire life will be reduced by 30% and rolling resistance will be increased by 40%.

Overloading inevitably causes early damage or scrap of tires.

4.Failure of the chassis.

In driving, due to the poor technical condition of some mechanisms of the automobile chassis, it is also an important cause of abnormal wear or damage to tires. Among them, the biggest damage to the tire is the inaccurate alignment of the front wheel, especially the front wheel is too large or too small will make the front wheel appear rolling with slippery phenomenon, resulting in serious wear of the tread on one side, and the pattern on the other side, even if the deviation from the standard is not much, it will also lead to the eccentric wear of the tread. Faulty front wheel alignment not only causes damage to the tires, but also directly affects steering performance.

In addition, the deformation of the frame or suspension, the displacement of the rear axle, the loose ball joint or knuckle of the steering tie rod, the excessive clearance of the wheel bearings, and the lag or locking of the brakes will cause abnormal wear and tear of the tires. Therefore, regular maintenance of the vehicle and front wheel alignment, especially the steering and braking systems, to keep it in good technical condition, will play a very important role in reducing tire wear and prolonging the service life.

In addition to the above-mentioned reasons for vehicle conditions, another reason for shortening the service life of tires is directly related to the driver, such as: sharp start, sharp acceleration, sharp braking, sharp turning, speeding, playing in the same direction, not paying attention to the choice of road surface, rolling obstacles, inspection and repair are not timely, etc.

1. Rear drive: half shaft or bearing deformation, loosening, wheel rim (steel ring) deformation, tire deformation with bulge, etc.; 2. Front drive: loose wheel bearings, deformation of the hub, deformation of tires, bulges, nails and stones, etc.; 3. The wheel loses its dynamic balance.

<> felt noticeable bumps at high speeds.

It's your hub that's deformed and not round.

If you run fast, it will definitely feel bumpy.

Check the dynamic balance of the tires first, and the uneven surface of the brake disc, so that the braking force is sometimes large and sometimes small when braking, resulting in body vibration, which is generally obvious when the brakes are lightly pressed.

If it's a tire problem, whether it's a highway or a regular road, there will be regular bumps, and if a normal road doesn't, it's a road problem.

This should be a problem with the road surface.

It may be that the air pressure of each tire is different, or there may be a difference in the weight of the replaced tire and the original tire.

The tire pressure is not the same, you can adjust it to the same, if the tire weight is surprised, it affects the stability, and you need to do dynamic balancing.

Dynamic Balance] Some people call it four-wheel balance.

When the steering wheel shakes or the wheels make some rhythmic abnormal noise when the vehicle is driving at high speed during driving, it is possible that the wheels should be dynamically balanced, especially when the tires are replaced, the wheel hub or the tire is repaired, the wheel is hit too much, and the balance weight is lost due to bumps. Don't underestimate the dynamic balance of the wheels, if the dynamic balance of the wheels is not good, it will cause abnormal wear of the tires, and it will also affect the stability of the vehicle. Especially on the front wheels, the vibration will be transmitted to the steering wheel through the steering system, which will not only affect the driving of the driver's friends, but also cause the steering system to loosen.

The air pressure of the four tires is not the same.

The steering wheel shakes.? Consider doing a balancing.

It may be that there is a problem with your steel rim Secondly, if you run to forty or fifty times when the bumps are not bumpy fast and slow, it is basically your vertical shaft should be replaced, if it has been bumpy, it may be a problem with the bridge, it is recommended that you check whether the tires are symmetrical and measure the front pivot by the way.

The rim has been scooped and has become oval.

Check the method, put the wheels off the ground, rotate quickly, observe a position, whether it will go up and down, if it will, it is the rim scoop.

Minor ones can be corrected by adjusting the tightness of the spokes, and serious ones can be changed to the rims.

It is recommended to go to a nearby car shop for repairs.

If the road is very flat is the wheels of the car is not good, the advice to you is to buy a new one directly because once the wheels are deflected, it means that the quality of the wheels is not good, spend about 400 to buy a pair of DP20 wheels, if it is a V-brake car to buy DH19, the money will be less. The problem is solved perfectly.

It's not that the car can't work, it's that the road is uneven.

Some cement roads seem to be very flat, but a closer look reveals that the road surface is slightly wavy, at this time if the speed of cycling is fast, it will feel a little bumpy, in fact, this is not a problem of the car but a problem of the road, this situation is relatively rare on the asphalt road.

Reasons why the direction of the car is unstable when it is bumpy while driving:

1. Wheel dynamic imbalance: the mass distribution of the wheel is asymmetrical relative to the longitudinal center plane of the wheel, and the force couple with changing direction will occur when rotating; That is to say, when there is a problem with the mass distribution of the wheels, after the wheels of the car rotate at high speed, a dynamic imbalance will be formed, resulting in the phenomenon of the wheels shaking or body shaking of the car while driving.

In order to eliminate the dynamic imbalance, the wheels are usually dynamically balanced. Generally, dynamic balancing is required when replacing new tires or repairing tires, strictly speaking, as long as the tires are removed, dynamic balancing must be done.

Second, the wheel deformation: the wheel hub is the main component to support the overall body of the car, after the tire is inflated, the outer edge of the tire will be closely fitted with the hub flange to prevent gas leakage in the tire, and it is difficult to ensure that the tire will not "slow gas" when there is a problem with the wheel. In the process of car use, sometimes when the tire pressure is low, the high-speed bump into potholes or bulging objects and damage the wheel, the lower the tire thickness (low aspect ratio) some sports tires are more likely to knock the wheel. Once the wheel hub is deformed and out of roundness, the car will have related fault phenomena such as vehicle deviation, violent bumps, steering wheel shake, tire leakage, and abnormal tire wear (tire eating) during driving.

3. Shock absorber failure: Shock absorber failure directly affects the comfort and driving stability of the car, and the shock absorber can be called a vulnerable part of the car due to poor working conditions. The failure of the shock absorber will lead to abnormal noise, large vibration, poor driving stability, body tilt and other fault phenomena of the car.

Fourth, the inner cage failure: the damage of the inner cage will cause the car to accelerate and shake or cause the car to shake in the left and right directions, and in serious cases, it will implicate damage to other parts of the front axle, such as the steering ball joint, the tie rod rubber sleeve, and even the entire suspension.

Fifth, the chassis stabilizer bar rubber sleeve: although the rubber sleeve of the stabilizer bar is small, but the role is not small, the abnormal noise of the automobile chassis and the vibration of the vehicle on the uneven road are mostly related to it. The failure of the rubber sleeve is frequent, because the rubber will have a service life, and it will age over time, and it is easy to be damaged.

6. Damage to the ball joint of the steering tie rod: damage to the ball joint of the steering tie rod will not only cause the car to deviate, but also easily cause the car to be unstable and sway from side to side.

No matter what kind of car it is, as long as it reaches a certain mileage, as long as you walk on uneven roads or small potholes, there will be steering wheel shake, and the right body is difficult to control. This makes it difficult for drivers to drive and can even lead to unsafe driving.

There are several aspects to be aware of when steering wheel shake occurs:

1. When the car is driving, the steering tie rod and the steering cross tie rod are deformed due to collision, and the ball joints of each part are worn loosely or the tires are worn irregularly, which increases or shrinks the toe-in.

2. When the car is driving, due to the damage of steering shock absorption, oil leakage or deformation of the front hanging spring, it also affects the stability.

3. The loose wheel bearings and the ball joints of the left and right steering joints are seriously worn, so that the front wheel positioning is inaccurate.

Fourth, the ball head of the transverse thrust rod is loose or the bracket is loose, resulting in unstable driving.

Fifth, the wheel is unbalanced, the balance of the original wheel lead falls off or becomes a high-speed driving state under the car's hair swing, resulting in steering wheel shaking.

Basically, the ball head is loose, and there is a problem with the direction of the cross, it is recommended that you go to the 4S store to test it

Consider examining the following.

1. Check whether the tread has abnormal wear (e.g., eccentric wear, feather wear, etc.), and if found, it is necessary to confirm the cause of abnormal wear in time (e.g.; Four-wheel alignment data is inaccurate).

2. Check whether the dynamic balance of the tire is normal.

3. Check whether the tire pressure is normal.

If it is determined that the abnormal noise occurs due to the uneven top of the tire, the dynamic balance and positioning are basically ineffective, and it is useless to change the position. Whether there is danger depends on all the factors in the outside world, when it comes to tires, you just 20,000 kilometers, generally fine. I'm just talking from experience, I hope it will be useful to you.

There is no danger if you don't need to replace it, you can do the tire change first, then do the dynamic balance transposition, and then do the four-wheel alignment.

Maybe eat the tire to do the positioning, and the balance is not expensive.

Hello, there is no need to change the tire, it is recommended to adjust the position of each tire, so that the force of each tire is even, you go to the place where the tire is repaired and let it be adjusted. You can now check the surface of the tire to see if there are any slightly larger pebbles stuck in the tire pattern.

It is recommended that you do a four-wheel alignment for your car, and the tires will be good in the future, and there will be no more ringing and bumps.

I hope you will take it on board.

There will be no bumps because it is fast and there is almost no sensation.

Check the flat bearings above the shock absorber or something called top glue.

Generally, the bushing deformation of this accessory, the gum degeneration will also appear in the sound, and the car condition is older, you can check the engine rubber pad by the way, if it has not been replaced, it is estimated that the gum should also age.

Therefore, it is better to use new tires for the front wheels. This is true for both trucks and sedans. A car that loses control of its direction is extremely scary and prone to punctures. The old rubber aging front wheels bear about 70% of the braking power.

If there is a slight shaking or deviation of the body during driving, it is generally caused by the fault. There are generally three reasons for this.

1. It may be that the tire balance is not good, and the owner needs to do a four-wheel alignment and dynamic balance as soon as possible.

2. It may be caused by the deformation of the steel rim, which requires the owner to go to a professional repair shop for inspection, which generally occurs in vehicles with a long service life. Generally, when the car is replaced with new tires and new steel rims, it is necessary to do a tire balance, otherwise the steering wheel will be prone to shake when the counterweight is uneven. Body shake will have an impact on driving comfort and handling judgment.

3. It is caused by the unbalanced deformation of the transmission shaft, which generally occurs in more cars that have collided on the ground.

Hello! There are many reasons for vehicle shaking, such as poor dynamic balance, abnormal tire wear, tire installation, air pressure, and vehicle positioning or component damage.

Did you mark the tires before changing them? Did you do the balancing?

The tire model is right! And whether the tire pressure is too much, do the balance to see.

Hello! The left front wheel of the car is upside down.

The clattering sound of the dustpan. For this kind of failure, please check: whether the rubber sleeve of the lower arm is damaged and loose.

Whether the lower arm ball DAO head is damaged. Is the steering machine tie rod and tie rod ball joint damaged? Also check the front shock absorber for oil leakage or damage.

Whether the top glue of the shock absorber is damaged. Hope it helps. [Car questions, ask the car master.]

4S shop professional technician, 10 minutes to solve. 】