Problemi comuni delle biciclette elettriche che possono essere risolti in casa

Riding a bike is a joy, but the occasional glitches along the way are always a letdown. The first thing most people think of when they encounter a fault is to go to a repair shop for maintenance, but it turns out that some problems can be easily solved. In order to avoid this kind of situation that consumes energy and money, this article will summarize 16 common bicycle failure problems to help you judge the condition of bicycles.

Problem 1: Noise when pedaling


Reason and suggestion:

Due to the looseness of the three joints of the crank, the axle core and the pedal, or the friction produces noise. Taking a loose crank bolt as an example, you can tighten the crank bolt, if the crank still rattles, remove it, grease the axle core, and reinstall the crank.


Problem 2: The gear line tube rubs against the frame and can easily wear off the paint.


Anti-friction silicone or rhino leather anti-friction tape can be attached to the contact place.


Problem 3: The flywheel is rusted.



If the rust is not serious, use more lubricating oil to prevent continued rust. At the same time, the chain will also wear off some rust in the process of riding.


Problem 4: The rear derailleur keeps making a squeaking noise.


Reason and solution:

  1. There has been a crash or rubbing, resulting in the deformation of the tail hook. Check whether there is a deviation, if the deviation is serious, it is recommended to replace it directly;
  2. The guide wheel has not been cleaned for a long time, resulting in dirt. First clean with cleaning agent, then drip with lubricating oil to lubricate and wipe off excess oil.
  3. The outer corner of the guide wheel is severely worn, and the obtuse angle is ground into a sharp angle, which may also produce abnormal noise. In this case, it is recommended to replace the guide wheel.


Problem 5: The chain makes abnormal noise.


Reason and solution:

The chain is short of oil, which is caused by insufficient lubrication between the chain pieces.

Add chain oil or lubricant and wipe off excess oil.


Problem 6: When using a certain gear ratio, there is a jumping gear when pedaling.


Reason and solution:

There may be foreign objects such as mud, weeds, leaves, and branches between the flywheels. The foreign objects between the flywheels may easily prevent the chain from engaging with the flywheel normally, and should be cleaned in time. If there are no foreign objects, the sprocket may be worn out and the chain and sprocket will usually need to be replaced.


Problem 7: The V-brake is weak when braking, but the brake pads are not seriously worn.


Reason and solution:

Due to loose brake lines or serious wear on the CNC rim stripes used on the body.

Turn the brake fine-tuning nut counterclockwise (usually near the brake caliper or brake lever, at the end of the brake line tube), so that the brake block is close to the rim. Adjust the sensitivity according to personal habits.


Problem 8: Squealing noises when braking.


Reason and solution:

  1. The brake pads have quality problems or the hard brake pads used are prone to abnormal noise. You can replace the better quality brake pads or soft brake pads.
  2. The brake pad has been inclined due to installation or external force, and the mating surface is uneven or even touches the outer tire. At this point, the brakes should be readjusted.
  3. The aluminum scraps attached to the brake pads rub against the rim. You can use sandpaper or a file to polish the brake pads to remove the aluminum scraps on the surface.


Problem 9: The pegs turn when they are removed.


Reason and solution:

Use a flat-blade screwdriver or a special disk nail tool to fix it in the groove on the back of the disk nail, and then remove it.


Problem 10: The pedal falls off.


Reason and solution:

After the pedal falls off, you should check whether the thread connecting the pedal on the crank is complete. If it is intact, re-install the pedal and tighten the screw. If the threads on the pedals are damaged, you cannot continue riding, only the cranks can be replaced.


Problem 11: Crank falls off.


Reason and solution:

The falling off of the crank is caused by the loosening of the screw fixing the crank, and the daily riding will slightly loosen the screw fixing the crank. Check regularly and fix with hexagon socket.


Problem 12: The outer tire is torn.


Reason and solution:

The complex road conditions of long-distance and off-road riding can easily lead to the splitting of the outer tire. If it is not repaired in time, it is easy to cause the inner tube to burst.

First observe whether the crack is on the front or side of the tire. If it is on the side, you need to replace the outer tire immediately; if it is on the front, and the crack is not more than 0.5cm, and a special patch can be used to repair the crack temporarily (for example, PARKTOOL has such product).


Problem 13: The tire is stuck with a nail.



After the tire is nailed, the nails should be removed as soon as possible to prevent the inner tube from being punctured multiple times. If the number of holes in the inner tube is small, it can be repaired with the self-contained tire repair tool, or the inner tube can be replaced directly.


Problem 14: After the inner tube was repaired, it was deflated just after it was put back in.

Reason and solution:

The pads are misplaced or foreign objects remain in the tire.

If the hole in the inner tube is on the inside, the pads may be misaligned, causing the tube to be cut by the spokes; if it is on the outside, there may be some small, sharp foreign objects in the tire. Carefully grope the inside of the tire with your fingers to find the foreign object and remove it.


Problem 15: Frequent tire punctures.


Reason and solution:

The tire pressure is too low, or the riding speed is too fast, and the road conditions are not paid attention to in time.

The tire is marked with a standard pressure value. For ordinary riders, the recommended tire pressure is 140 psi ~ 120 psi minimum. This pressure value comes from the test. When it exceeds 140 psi, it will increase the rolling resistance. If it is too low, it will be easy to scratch the tire ; In addition, when the road condition is poor, it is recommended to detour slowly.


Problem 16: Tire patch fails to bond to inner tube


Reason and solution:

The inner tube is not roughed enough, and there are still many impurities on the surface; there is an air gap between the patch and the tire; there is less glue, and the patch is moved before it is completely dry.

Clean the inner tube, mark it when you find the crack, apply more glue and make sure that the crack is in the center of the tire patch when sticking, give the glue enough time to dry, about 5 minutes.

Of course, you can also choose a simple and fast glue-free tire patch.

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