8S /9S Bicycle Rear Derailleur

What is the reason why the Bicycle Rear Derailleur does not match the chain?

The reasons why the Bicycle Rear Derailleur (Bicycle Rear Derailleur) does not match the chain can be attributed to many aspects. These reasons may lead to problems such as unsmooth shifting, chain skipping or falling off, etc., affecting the comfort and safety of riding. Here are some of the main reasons why your rear derailleur may not match your chain:
First, chain wear and aging are common factors that lead to mismatches. As time goes by and mileage is increased, the chain will gradually wear out, the gaps between the links will become larger, and the overall length of the chain will also stretch. This wear can cause the chain to loosen the fit between the gears of the rear derailleur, affecting the accuracy and smoothness of shifting.
Secondly, wear or damage to the rear derailleur can also cause a mismatch. During long-term use of the rear derailleur, its internal springs, bearings, connecting rods and other components may be worn or deformed, causing it to be unable to accurately move the chain to the required freewheel sprocket. In addition, if the rear derailleur is impacted or improperly installed, it may cause deviation in its position or angle, further affecting its matching with the chain.
Third, the tension problem of the transmission cable is also an important reason for the mismatch between the rear derailleur and the chain. If the tension of the shift cable is too tight or too loose, it will affect the action of the rear derailleur. Too tight a tension may cause the rear derailleur to experience excessive resistance when shifting, while too loose a tension may prevent the rear derailleur from being fully seated, causing the chain to fail to engage properly with the cassette sprocket.
In addition, improper installation and adjustment are also common causes of mismatch. When installing the rear derailleur, if its position or angle is not adjusted correctly, or the length and position of the shift cable are not set accurately, it may cause matching problems between the rear derailleur and the chain. At the same time, when adjusting the transmission system, if the correct steps and sequence are not followed, mismatching may also occur.
Finally, compatibility issues between different makes or models of rear derailleurs and chains can also cause mismatches. Different brands or models of bicycle components may have differences in design and manufacturing. If you choose an incompatible rear derailleur and chain, it may cause them to not fit together correctly and affect the shifting effect.
Therefore, the reasons why the Bicycle Rear Derailleur does not match the chain can be attributed to chain wear, rear derailleur damage, shifting cable tension issues, improper installation adjustment, and compatibility issues. In order to ensure the comfort and safety of riding, we should regularly check and maintain the bicycle's transmission system, replace worn parts in time, and correctly install and adjust the rear derailleur and chain.