Bicycle Quick Repair Tips: Easily Solve 25 Common Problems

Nowadays, the cycling craze is sweeping across, whether commuting on city streets or enjoying nature in the suburbs, bicycles have become the preferred choice for many people due to their dual advantages of fitness and convenience. However, during the cycling process, occasional "tantrums" and minor incidents on the bike can be quite troublesome. Don't worry, this carefully organized bike repair guide will take you through 25 common problems one by one, making your cycling journey smooth and unobstructed!

1. After repairing the tire, it deflates again: After repairing the inner tube and putting it back in, it deflates again. First, check the location of the hole. If it is on the inside of the tire, it is highly likely that the gasket is misaligned, causing the inner tube to be cut by the spokes; If the hole is on the outer side, there may be small and sharp foreign objects hidden in the outer tire. At this point, put on gloves and carefully grope the inside of the outer tire with your fingers to pull out the foreign object.
2. Frequent tire blowouts: Insufficient tire pressure is a common cause of tire blowouts, especially for road vehicles. It is recommended to set the tire pressure to the maximum pressure value indicated on the outer tire label to effectively reduce the risk of tire blowouts.
3. Difficulty in installing the outer tire: reinstalling the outer tire but not fitting it into the car rim? First, release the air and twist the incorrectly installed part back and forth. Then inflate it to around 30psi, and slowly rub the outer tire into the correct position by hand. During the process, push the outer tire towards the center, carefully check for any exposed inner tube, and ensure that the inner tube is fully seated before inflating.
4. Poor adhesion of tire patch: The tire patch cannot stick to the inner tube, mainly due to problems with the amount of glue and operation details. Apply more glue and patiently wait for it to air dry naturally for about 5 minutes. Never blow with your mouth, the water vapor blown out will interfere with the bonding effect. When using tire patches, do not touch the adhesive surface with your fingers.

1. Abnormal wheel noise: When riding, the wheels make a squeaking sound. First, check the spokes. If the tension of the spokes is uneven, tighten them tightly; If the tension is normal, it may be caused by a slight collision between the intersecting spokes. Apply a small amount of lubricating oil at the intersection and then wipe off excess grease.
2. There is a sound when pedaling: there is a creaking sound when pedaling, first tighten the crank bolt. If it still makes noise, remove the crankshaft, apply a layer of grease to the shaft core, and reinstall it.
3. The large gear plate shakes and the chain rubs against the front shift guide plate: When the large gear plate shakes and the chain still rubs against the front shift guide plate, check whether the disc nails are loose and tighten the loose disc nails.
4. Abnormal front shift: After cleaning the gear set, the front shift is not accurate, which is likely due to the gear being installed backwards. Remove the gear plate, install it correctly, ensure that the crank bolt fits the mounting hole of the gear plate, and the spacing between the gear plates is even when viewed from above.
5. Difficulty in disassembling the disk nail: Do you want to disassemble the disk nail, but it turns along? Using a wide flathead screwdriver or specialized nail tool, clamp the groove on the back of the nail and it can be easily disassembled.
6. The sliding wire of the crankshaft cannot be disassembled: When disassembling or adjusting the crankshaft, the wire may slip, so don't worry. Go ride a few laps, the crank may loosen during the ride, and it can be removed later.
7. Grinding the frame with the transmission cable tube: When the transmission cable tube rubs against the frame, the car paint is worn off. Applying transparent tape to the contact area can provide protection.
8. Rear shift problem (noise, inaccurate gear shifting): After adjusting the rear shift, the problems of noise and inaccurate gear shifting still exist, and the problem may lie in the flywheel lock ring. If it becomes loose, the flywheel will shake and there will be noise when it rotates. Use specialized tools to tighten the locking ring, and in emergency situations, try to tighten it with your fingers as much as possible. First, safely ride home or go to a nearby car dealership for assistance.
9. Rusting of flywheel: If there is a little rust on the flywheel, don't panic too much. A small amount of rust generally won't accelerate the wear of the flywheel plate. Applying more lubricating oil can not only prevent rust, but also slowly wear off the rust on the chain while riding.
10. Jumping teeth problem: When stepping with a specific gear ratio, first check for mud, weeds, and other foreign objects between the flywheel blades, and if so, dig them out. If there are no foreign objects, it is highly likely that the flywheel is worn out, and it is usually necessary to replace both the chain and the flywheel at the same time.
11. Inaccurate front shift: The front shift cannot accurately switch the gear plate. First, observe from directly above whether the guide plate and gear plate are parallel. If they are not parallel, release and reposition. If it is parallel, it may be necessary to adjust the high/low limit screws. It is recommended to find a car dealership technician or an experienced person to operate it.
12. High noise from the rear dial: The continuous sharp noise from the rear dial indicates a lack of oil in the guide wheel. Apply oil to the guide wheel from the side and wipe off excess grease.

1. Weak braking: The brake pads are fine, but the brakes are soft and the brake wires are stretched. Find the brake fine adjustment nut (usually near the brake caliper or brake lever, at the end of the brake line pipe), rotate counterclockwise to bring the brake pad closer to the rim, and adjust according to your own braking habits.
2. Brakes have a dragging sensation: When braking, there is a dragging sensation, most likely due to grooves or small pits on the brake surface of the car, which will hit the brake pads every lap. This situation is difficult to handle on one's own, so take the car directly to the dealership for maintenance.
3. One side brake pad rubbing against the wheel rim: If one side brake pad rubs against the wheel rim or is very close to it, first open the wheel quick release and correct the wheel. Often, the problem can be solved. If the wheels are fine, adjust the brakes. Most brakes are adjusted by turning the adjustment screws on the side or top of the brake caliper (one on each side), adjusting them slightly each time and observing the changes in the position of the brake pads. If the brake is in the center of the wheel and the brake block still rubs against the rim, it may be that the two sides are worn unevenly due to improper adjustment, and the brake block needs to be polished and corrected again.
4. Brake Scream: Scream harshly when braking, first wipe off the oil and cleaning agent on the car rim. If it still doesn't work, use sandpaper or file to polish the brake pads. If there is still noise, release the brake pad, adjust the forward tilt angle, and let the front half of the brake pad contact the wheel first. It may be a bit difficult for beginners to operate, so if not, seek help from a car dealership.

1. Abnormal noise from the car seat: Every time you press it, the car seat makes a noise, most likely because the seat is loose. Just tighten it.
2. Seat squeaking sound: Dripping a few drops of lubricating oil at the connection between the seat rail, seat cushion, and seat pole can effectively eliminate the squeaking sound. But if the leather car seat cracks like leather shoes, there's nothing we can do.
3. Unable to remember the direction of foot pedal disassembly: tighten the right foot pedal clockwise and loosen it counterclockwise; Step on the thread with the left foot in the opposite direction, tighten counterclockwise and loosen clockwise. If you really can't remember, remember to use the wrench to apply force backwards when disassembling the foot pedal.
4. Inverted foot pedals: Accidentally reversing the foot pedals left and right may damage the crankshaft, as the crankshaft threads are softer than the foot pedals. Before installation, be sure to carefully check the "R" (right) or "L" (left) markings on the pedal shaft.
5. The bowl group is too tight after adjustment: After removing the bowl group for lubrication, no matter how it is adjusted, it still feels tight. It may be because the bearing guard ring is installed incorrectly. Reinstalling it can solve the problem.

This is Ningbo Shenglu Bicycle Industry Co., Ltd., specializing in the production of bicycle accessories for more than 20 years. The main products include bicycle wheelsets, flywheels, bowl sets, flower drums, brakes, and axles. Our products cover more than 100 countries worldwide and are a world-renowned brand. We welcome buyers and bosses who are looking for bicycle parts to contact us for cooperation and create wealth together.

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