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If you change it to do maintenance, it is still "smooth", but it is too much trouble to run over and give a few dollars to adjust the chain . The following small series teaches the riders how to adjust the tightness of the chain in one minute . 
Of course, the motorcycle is tight and you must feel that the motorcycle chain is too loose, it is easy to hit the chain cover, and even the chain will cause secondary hazards; the chain is too tight, the energy loss will be large, It will be easy to break the chain. Therefore, it is more important to master the degree of “relaxationâ€. It is recommended to refer to the chain standard of the car . 
Prepare two can mobilize the width of a spanner (wrench), for the average household in terms straddle car, adjust the tightness of the chain, the key is to adjust the distance of the rear wheel with the swing arm "before and after." The more the tire is, the looser the chain is, and the later the tire , the tighter the chain . 
It is worth noting that:
1, most models have a chain description, the upper and lower range is between 15-20 mm;
2, according to different models, the range of the float of the chain is also different, the general off-road motorcycle is larger than the family car, it needs to be compressed by the long stroke of the rear shock absorber to reach the normal range value;
3, after adjusting the tightness, be sure to tighten the screws of the rear wheel;
4. If the chain is used for a long period of time, it is difficult to adapt after repeated adjustments. It is recommended to check the chain wear of the car or change a new chain .
In our daily cycling, I believe that most of my friends have encountered a seemingly small problem - the car chain is "squeaky" when riding. At this time, many riders who don't understand the car would rather use a few dollars to get to the nearest motorcycle repair shop. I believe that when you are not ready to pay the master, the master has already told you to fix it.