Fault 1: There is a sound when pedaling.
Reasons and suggestions: It may be that the crank, the shaft core, the three joints of the pedal are loose, or the friction produces sound. For example, if the crank bolt is loose, the crank bolt can be tightened. If the crank is still ringing, remove it, apply a layer of grease to the shaft core, and then reinstall the crank.
Fault 2: The shifting line tube smashes the frame and wears off a piece of paint.
How to solve: Anti-friction silicone or rhino skin anti-friction tape can be attached to the contact area, which is available on Taobao.
Fault 3: The flywheel is rusty
How to solve: When the rust is not serious, use more lubricating oil to prevent rust. At the same time, during the riding process, the chain will also wear off some of the rust.
Fault 4: The rear dial continues to make a spike of noise.
Reasons and solutions:
1. There have been crashes or smashes, which caused the tail hook to deform. Check for deviations. If the deviation is serious, it is recommended to replace it directly.
2, the guide wheel has not been cleaned for a long time, a lot of dirt. Wash with a cleaning agent, then apply grease to lubricate and wipe off excess oil.
3. The outer corner of the guide wheel is seriously worn, and it is sharply angled by the obtuse angle. It is also possible to produce abnormal noise. In this case, it is recommended to replace the guide wheel.
Fault 5: The chain is abnormal.
Cause: The chain is short of oil and the chain is not fully lubricated.
Solution: Add chain oil or lubricant and wipe off excess oil.
Fault 6: When using a certain gear ratio, the stepping gear appears.
Reasons and solutions: If the flywheels are stuck with mud, weeds, leaves, branches and other foreign objects, dig them out. Because it will hinder the chain and the flywheel to properly engage. If not, the flywheel may have worn out and it is often necessary to replace the chain and flywheel.
Fault 7: The brake is weak when the brake is applied, but the brake block is not worn seriously.
Reason: Due to the loose brake line or the wear of the CNC rim strips on the body.
How to solve: Turn the brake trimmer nut counterclockwise (usually near the brake caliper or brake handle, the end of the brake line tube), so that the brake block is close to the rim, and adjust the sensitivity according to personal habits.
Fault 8: Screaming when braking.
Reasons and solutions:
1. The quality of the brake pads or the hard brake pads used are prone to abnormal noise, and the brake pads or soft brake pads with good quality can be replaced.
2. The brake pad has been tilted due to installation or external force. The mating surface is uneven or even touched to the tire. At this time, the brake is re-adjusted.
3. The aluminum scraps attached to the brake pads are rubbed against the rim. The brake pads can be polished with sandpaper or trowel to remove the aluminum chips on the surface.
Fault 9: It rotates when the disc is removed.
Reason and solution: Fix it in the groove on the back of the plate nail with a screwdriver or special nail tool, then remove it.
Fault 10: The pedal is falling off.
Reason and solution: After the pedal is detached, check whether the thread connecting the pedal on the crank is complete. If it is intact, reinstall the pedal back and tighten the screw. (Be sure to tighten the screw with a tool. If the thread on which the pedal is installed is damaged, it is impossible to continue riding and only the crank can be replaced.
Fault 11: The crank is off.
Cause and solution: The crank-off is caused by the looseness of the screw that fixes the crank. The daily riding will slightly loosen the screw that fixes the crank. Regularly check and fix with a hexagon socket.
Fault 12: The tire is split.
Reason: The complicated road conditions of long-distance and off-road riding are easy to cause the tire to split. If it is not repaired in time, it will cause the tire to burst.
How to solve: 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 tire immediately; if it is on the front, the crack does not exceed 0.5cm, temporarily use a special patch to repair the crack (for example, PARKTOOL There are such products).
Fault 13: The tires are tied.
How to solve: After the tire is nailed, the nail should be taken out at the first time to prevent the inner tube from being pierced many times. If the inner tube is less than the number of holes, you can use the own tire repair tool to repair, or directly replace the inner tube.
Fault 14: After filling the inner tube, just put it back and smashed it again.
Cause: The pad is misplaced or foreign matter remains in the tire.
How to solve: If the hole on the inner tube is on the inner side, the pad may be misplaced, causing the inner tube to be cut by the spoke; if it is on the outside, there may be some small and sharp foreign objects in the outer tube. Use your fingers to carefully explore the inside of the tire, find foreign objects and take them out.
Fault 15: Tire often.
Cause: The tire pressure is too low, or the ride speed is too fast, and the road condition is not paid attention to in time.
How to solve: The tire has a standard pressure on the tire. For the average rider, the tire pressure is recommended to be 140 psi to 120 psi. This pressure value comes from the test. When it exceeds 140 psi, it will increase the rolling resistance. Too low It is easy to tie the tires; in addition, when the road conditions are poor, it is recommended to bypass slowly.
Fault 16: The tire patch cannot be bonded to the inner tube.
Reason: The inner tube is not polished enough, and there are still more impurities on the surface; there is an air gap between the tire patch and the tire; there is less glue, and the tire patch is moved without being completely dry.
How to solve: Polish the inner tube, mark it when you find the crack, apply glue and make sure the crack is at the center of the patch, and give the glue enough time to dry, about 5 minutes.