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20 common breakdowns of bicycle repairs and detailed explanations: you can solve them by yourself, r

1. Every time the inner tube is patched up, it becomes flat after putting it back in

If the hole in the inner tube is on the inner side, the strap may be misaligned, causing the inner tube to be cut by the spokes; if it is on the outer side, there may be some small and sharp foreign objects in the outer tube. Use your fingers to carefully explore the inside of the tire to find the foreign object and take it out.

2 .Frequent punctures

Give the tires more air. Especially for road bikes, you might as well hit the recommended maximum tire pressure value.

3 Reinstall the tire, but it can’t fit into the rim normally

Release the air, twist the tire back and forth, rub the tire into the correct position with bare hands. Push the outer tube from the outside to the middle, and check if there is any inner tube exposed. When making sure that the inner tube is completely inside the outer tube, pump up again.

4 The tire patch cannot be bonded to the inner tube

Use more glue and let it dry thoroughly-about five minutes. (Don't blow with your mouth just to dry faster-this will leave moisture on it and prevent the glue from bonding). When using the tire patch, remember to avoid touching the adhesive surface with your fingers.

5 creaking wheels

There may be loose spokes. If the tension is balanced, the sound may be caused by a slight collision of the crossed spokes. Lubricate the intersection with a small amount of lubricating oil and wipe off excess lubricating oil.

6 There is a noise when pedaling

Tighten the crank bolt. If the crank still creaks, remove it, apply a layer of grease to the shaft core, and then reinstall the crank.

7 The large chainring shakes, and the chain rubs against the front guide plate

It may be that the disc nails are loose. Look for the loose disc nails.

8 The chain and chainring were removed and the chainring set was cleaned, but the front derailleur shift was incorrect

The chainring may be installed upside down. Remove the chainring and install it correctly. Usually, the crank bolt fits right into the mounting hole of the chainring. Seen from directly above, make sure that the spacing between the chainrings is even.

9 You try to remove the nail, but it turns

Use a wider flat-head screwdriver or a special nail tool to fix it in the groove on the back of the nail.

10 You tried to disassemble or adjust the crank, but the wire slipped-now I can’t remove it

Ride a few more laps around. The crank will loosen, and then you can take it off.

11 The transmission line tube rubs against the frame, and a piece of paint is rubbed off

Put scotch tape on the contact area.

12 Adjusting the rear dial still cannot improve the noise and inaccurate shifting problems

The flywheel lock ring may be loose, causing the flywheel to slightly shake and make a sound when it rotates. A special tool is required to fully tighten the lock ring, but you can use your fingers to tighten it as much as possible to ensure a safe ride home or to a nearby car shop.

13 The flywheel is rusted

A small amount of rust will not accelerate the wear of the flywheel, so there is no need to worry too much. Generally, using a little more lubricating oil can prevent continued rusting, and the chain can wear off the rust when riding.

14 When using certain gear ratios, tooth skipping occurs when pedaling

There may be something between the sprocket. If you can see mud, weeds, leaves, branches or any foreign objects stuck in the flywheel, dig it out. These things prevent the chain from engaging the flywheel properly. If there is nothing, this flywheel may have worn out. This phenomenon usually indicates that the chain and flywheel need to be replaced.

15 The front derailleur cannot be accurately changed to a certain chainring

Check whether the guide plate is parallel to the chainring (viewed from directly above), loosen and reposition the front derailleur according to the situation. If they are parallel, you may need to adjust the high/low limit screws, preferably by a car shop or an experienced person.

16 The rear dial continues to make a sharp noise

The guide wheel is short of oil and needs lubrication. Lubricate from the side and wipe off excess oil.

17 The brakes feel weak, although the brake shoes do not need to be replaced

The brake cable may be stretched. Turn the brake fine-tuning nut counterclockwise (usually near the brake caliper or brake hand, at the end of the brake line pipe) to bring the brake shoe close to the rim. Adjust according to your habits.

18 There is a drag feeling when braking

The brake surface of the rim may have grooves or apricot. Every lap hits the brake pads, which makes people feel uneasy. Take the car to the car shop.

19 One side of the brake block is rubbing against the rim or very close

Before fiddling with the brakes, turn on the quick release of the wheels and adjust the wheels to see if the problem can be solved (this is the most common solution.) If the wheels are straight, but one side of the brake block is still rubbing against the rim, you need to adjust the brakes. Most brakes are now adjusted by screwing an adjustment screw on the side or on the brake caliper (usually there is an adjustment screw on each side.) A few adjustment screws to see if it affects the position of the brake block. If the brake is located in the center of the wheel, but the brake block still rubs against the rim, the two sides may wear unevenly due to the previous incorrect adjustment; flatten the brake quickly and recalibrate.

20 Every time you pedal, there will be a sound from the seat

The seat may be loose. Tighten.


  • webboowebboo Posts: 3,846
    That is some classic advice. Does your bike have nails, mine appears not have any.
    No18 take the car to the car shop. Magic.
  • daniel_bdaniel_b Posts: 9,647
    edited 27 July
    Number 2 caught my eye!
    And I went no further.

    2 .Frequent punctures

    Give the tires more air. Especially for road bikes, you might as well hit the recommended maximum tire pressure value.

    Felt F70 05 (Turbo)
    Marin Palisades Trail 91 and 06
    Scott CR1 SL 12
    Cannondale Synapse Adventure 15 & 16 Di2
    Scott Foil 18
  • monkimarkmonkimark Posts: 814
    The rim may have apricot?
  • jpj84jpj84 Posts: 48
    edited 27 July
    Hate that drag feeling when braking - always keep your braking surfaces well lubricated folks
  • me-109me-109 Posts: 1,427
    #3 "making sure that the inner tube is completely inside the outer tube"

    Where do I get outer tubes? Do these go between the inner tube and the tyre?

    #11 "transmission line tube" - do you mean 'chain'? If so why not check your translation because it worked elsewhere.
  • MattFalleMattFalle Posts: 6,156
    daniel_b said:

    Number 2 caught my eye!
    And I went no further.

    2 .Frequent punctures

    Give the tires more air. Especially for road bikes, you might as well hit the recommended maximum tire pressure value.


    why is that funny?
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