What is the abnormal sound of the axle of a mountain bike?

It is possible that the central shaft is slightly shorter.

Water ingress into debris. Or metal chips from bottom bez.

The screws are not tightened, causing the front and rear to loosen, and it does not sound when it is fast and stable, but there will be a ...... when the car is shaken to accelerateThank you.

I used to be like that.

Take it apart and wipe it down.

That's it. Which kind of problem does your question fall into, go to the store and see.

The most serious thing is to change the bottom bracket.

It's easy to say.

If the central axis is muddy and sandy.

Check to see if the car is out of warranty.

If there is no warranty period, go to the store to do some cleaning and maintenance.

That's it. Out of the warranty period, just change the bottom line.

It's only a few dozen dollars.

The question is, whether the central axis rings or not.

Sometimes it sounds like the bottom bracket rings, but it's the rear axle or something else.

Let's talk about two ways to judge whether the central axis rings.

1. Hang the chain to the smallest wheel of the crankset, and pick the chain away from the crankset by hand.

At this time, shake your hands and feet to listen to whether there is any sound.

2. Swap the rear wheels of your own car with the rear wheels of other people's cars, and listen to whether there is any abnormal sound after replacing them.

If not, it's the rear axle that is partially ringing.

1. If the crank or crankset is loose, use a rubber hammer to hammer it a few times, and then tighten the crank or crankset fixing screw.

2. The steel ball or ball block inside the central shaft is damaged, this must be replaced on the central shaft, and you don't use your hands because the strength of your hands is much smaller than that of your feet, and it will not shake it.

3. The shaft lacks oil or dust is serious, if it is a sealed integrated shaft, only a new one, you have no way to add oil or take it out for cleaning, if it is the old-fashioned split bead block shaft, you can consider removing it to refuel or clean, but this shaft is generally difficult to dismantle, quite a test of your skills, tools and character.

4. There is also a possibility, mostly seen in the old-fashioned bead block shaft, that is, the outer bead block of the shaft is loose, resulting in a large gap between the steel ball and the bead block, resulting in abnormal noise, this repair is simple, luck with an open wrench to tighten the bead block, if your bead block shape is more special, the wrench or something can not be used, a hammer and a chisel waiting, the chisel is put on the bead block, regardless of the left and right bead block, all hammer in the direction of the rear wheel, and the hammer is OK.

The bottom bracket bearing is broken, replace it. **Remove the screw in the middle of the crankset and see if it's a square hole orSplines, just buy a bottom bracket with the same specifications and replace it. There are special tools to disassemble the sliding block shaft, go to the car repair shop, it is best to buy a bearing-style central shaft, buy a Taiwanese one online (estimated to be out of Kunshan, China) is about 30 yuan, very easy to use.

Mountain bike. The central axis is commonly used in the following types:

1. Loose bead type. 2. Sealing square type. 3. Sealed spline type.

4. Sealed hollow type. Mountain Biking Tips:Freestyle pedaling letter mess method:

At present, some elite athletes mostly use the balanced freestyle pedaling method. This pedaling method is to rotate the foot in a circle, depending on the position, the ankle joint.

The angle also changes.

Freestyle pedaling, in line with the principle of mechanics, the direction of force and the circular tangent formed when the pedal rotates.

consistently, the knee joint is reduced.

and the amplitude of movement of the thighs, which is conducive to increasing the frequency of pedaling and naturally passing through the critical zone.

Reduce dead spots. The thigh muscles can also be relatively relaxed. However, this pedaling method is more difficult to master.

1. The ordinary central axis kit is divided into "central axis, left bowl sedan chair Li Tan, right bowl, bead ring left and right" If you step on it, you will find that the central axis is a little shaky again, and it is uphill and "Kaka" sounds.

2. If the owner of the ordinary suite finds such a situation, Lima can solve this problem by changing the bead ring, because the quality of the bead ring is not good, there will be gaps due to excessive wear, resulting in such a problem, and if it is not replaced for a long time, it may cause damage to the entire kit.

3. The central shaft of the conjoined body is divided into "the central shaft, one on the left and one on the left and right of the bearing, the right bowl and the central shaft are integrated, and the left bowl" 2If it is an integrated bearing shaking and abnormal noise, it can only be solved by changing the whole kit.

If you find similar problems while riding, it is recommended to fix them as soon as possible, although it will not affect the ride, but it will be damaged by other parts.

The bicycle makes abnormal noises as soon as it pushes hard, and there are generally problems with the following components:

1. The chain is different from the lead soundDue to the lack of lubrication due to the dryness of the chain, too much adhered sediment will also produce abnormal noise, the chain is often blown by wind and rain outside, and it is necessary to regularly apply some lubricating oil to the chain to solve it;

2. Abnormal sound of flywheel chainring: The occlusion degree of the flywheel chainring and the chain is directly related to the lubricant, and the chainring can be properly coated with some lubricating oil; In addition, the relaxation of the chainring will also lead to a "click" abnormal sound, which needs to be solved by dismantling the chain and reorganizing the chainring;

3. Abnormal sound of foot pedal: Because the driver exerts pressure on the pedal to produce abnormal noise, most likely because of the loose or deformed pedal problem, it is recommended to replace a new set of pedals to solve.

Precautions. Abnormal sound of the central shaft is a very common problem, generally the abnormal sound of the central shaft is mostly caused by the degree of locking of the central shaft, or there is rain cement and sand intruding into the central shaft bearing, at this time, you need to go to a professional repair shop to use the bearing disassembly tool to reinstall the bearing.

When these parts are worn, aging and other undesirable phenomena, please be sure to pay attention to them, and check and replace them when they are good.

It may be that the degree of occlusion between the flywheel chainring and the chain is directly related to the lubricant, and the geared disc can be properly coated with some lubricating oil; In addition, the relaxation of the chainring will also cause a "click" abnormal sound, which should be solved by removing the tooth disc and reorganizing.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. For models equipped with turbocharged engines, there must be a difference between the sound and the sound of Li Shengyu with a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some cars come into contact with different cars, it is likely that due to their lack of understanding of mechanical knowledge, they mistake reasonable abnormal noise for vehicle failure.

Therefore, learn to distinguish the abnormal noise of the car and avoid wasting time and energy.

Second, the identification method of car noise:

In practice, due to the limitations of working conditions, it is difficult to describe and compare the sound of the car with special instruments. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.