The bicycle has been used for a long time, resulting in serious wear of the flywheel, so the chain will slip. The problem lies in the flywheel, and its teeth will jump. The solution is to go to a professional maintenance point to find a professional to replace the flywheel.
Bicycles will slip when used for a long time, which is caused by the wear of one end of the chain hole. You can open the joint, turn it around, and replace the inner ring of the chain with the outer ring, so that the damaged side will not directly contact the large and small gears, so that it will not slip.
Maintenance of bicycles:
1. After the car has been riding for a period of time, check and adjust all parts to prevent the parts from loosening and falling off, and regularly inject proper amount of engine oil into the sliding parts to keep lubrication.
2. Once the vehicle is wet by rain or damp, the electroplated parts should be wiped clean in time, and then coated with a layer of neutral oil (such as household sewing machine oil) to prevent rust.
3. Don't wipe the varnished parts, so as not to damage the paint film and make it lose its luster.
4. The inner and outer tires and brake rubber of bicycles are rubber products, so contact with oil products such as engine oil and kerosene should be avoided to prevent rubber from aging and deterioration. The new tires need pumping. Usually, the tires should be properly inflated, and the tires are easy to crack. Overinflation can easily damage tires and parts. The correct way is to pump less air in the front tire and more air in the rear tire. You should pump enough gas in cold weather, but don't pump too much in hot weather.
This bike has a heavy load. For ordinary bicycles, the load shall not exceed120kg; The load of heavy bicycle shall not exceed 170 kg. Because the front wheel design can only bear 40% of the weight of the whole vehicle, do not hang heavy objects on the front fork.
6. bicycle tire life extension method The pavement is generally high in the middle and low on both sides, and the bicycle must drive on the right. Therefore, the left side of the tire is often more worn than the right side. At the same time, due to the rear center of gravity, the rear wheel generally wears faster than the front wheel. Therefore, after the new tires are used for a certain period of time, the front and rear tires should be replaced and the left and right directions should be changed. This can prolong its service life.
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Daily maintenance
Check the chain: the chain will stretch after long-term use. The pitch of the chain is 0.5 inch. When measuring 24 chains, the length should be 12 inch. If the length exceeds the normal length 1/8 inches, replace the chain.
Cleaning the chain: If there is a lot of sludge on your chain, it may be time to clean it. You can use a chain washer to clean the chain, or you can remove the chain, find a container, fill it with solvent oil, put it in the chain, shake it and clean it, and finally take it out to dry and oil it.
Check the flywheel and the big toothed disc: if the flywheel has tooth jumping after the chain is updated, update the flywheel; If the teeth of the big toothed disc are seriously worn and the chain is stuck, it should also be replaced; Check the fixing screws of the big toothed disc; If it is loose, it must be locked again.
Check the rim: check whether there are slight cracks near the gas nozzle hole and the steel wire hole. If there is a crack, replace the rim as soon as possible, lift the wheel, turn the wheel, and observe whether the rim will rub against the brake pad. If so, please readjust the rim.
Check the steel wire: check whether the steel wire of the front and rear wheels is broken, and replace it if it is. After replacing the steel wire, the rim must be readjusted. When adjusting the rim, observe the direction of the rim deflection. If it leans to the right, loosen the right steel wire near the rim and lock it on the left, and vice versa. The left and right deflection amplitude of the rim should be less than 2mm.
Check the handlebar: check whether the driver is deformed in the accident and whether there is crack in the locking part of the riser. If so, please replace the handlebar.
Check the seat cushion and seat cushion rod: Remove the seat cushion rod and check for deformation or cracks. If not, put a thin layer of butter on it and put it back. Check whether the seat cushion is damaged and whether the bracket under it is intact. If there is any problem, please replace it.
repair
Check the wheel hub: remove the front and rear wheels, check whether there are cracks near the steel wire hole, and replace them immediately if there are any. Turn the hub shaft by hand to see, and then shake it up and down. If there is a gap, or it is loose, disassemble the hub shaft, clean up the oil inside, and then reinstall the new butter and the hub shaft. Remember to adjust the bearing to make the shaft rotate smoothly, but there will be no gap of shaking up and down.
Inspection center: Take off the chain, grab the crank and shake it left and right. If it shakes, lock the fixing screw. If it still shakes, adjust the center bearing. Put your ear on the seat cushion and turn the crank. The sound you hear should be a steady "whoosh" sound. If you hear abnormal sound or other strange sounds, it means that the bearing is damaged and the center should be replaced.
Check the pedal: remove the pedal, use an open-ended wrench of 15mm, and pay attention to the left pedal. Do not remove it wrongly. The pedal bearing does not need to be adjusted, but it still needs to be checked. If a box pedal is used, check whether its mechanism works normally and is lubricated. Check the transmission: check whether all moving parts of the transmission will shake. If so, the transmission is badly worn and should be replaced. Otherwise, lubricate the moving parts with oil.
Check the frame: check all the paint. If it rusts to the extent that the frame is perforated, the frame must be replaced. If the frame is deformed due to impact, it should also be replaced.
Update all internal and external conduits: All conduits have worn out after long-term use, so it is recommended to replace them to maintain their performance.
When riding a bike in the wild, the car broke down, which made you have to walk home. This is really a disappointing thing. So in order to avoid this situation, you must remember to bring tools when you go out to ride a bike. Don't think that accidents won't happen. It is always good to be prepared. The following describes the common faults and maintenance methods on site:
Flat tire: This is a frequent occurrence. When the tire has a puncture, remove the wheel, and use the tire removal tool to remove the outer tire and inner tube. If you have a spare tire, just install it directly. If you don't have a spare tire, you need to repair it. When mending a tire, first find out the hole, grind the hole slightly with sandpaper or rough things, then apply tire patching glue, and then stick it on when the tire patch is nearly half dry.
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