7S /8S Bicycle Rear Derailleur

How do I check the position of the Bicycle Rear Derailleur and adjust it to ensure it matches the chain?

Checking the position of your Bicycle Rear Derailleur and adjusting it to ensure it matches the chain is a critical step in keeping your bike's shifting system running smoothly. Here are some specific action suggestions:
First, check the position of the rear derailleur. Make sure the rear derailleur is the right distance from the cassette, neither too close to cause a collision when shifting, nor too far away to cause insufficient chain tension. At the same time, observe whether the guide wheel and tension wheel of the rear derailleur maintain the appropriate angle and distance from the chain to ensure that the chain can move smoothly.
Next, use the adjustment screws to fine-tune the rear derailleur. These screws are usually located on either side of the rear derailleur and are used to adjust its position on different cassettes. According to the actual situation of the chain on the cassette, rotate these screws appropriately so that the position of the rear derailleur matches the chain. During the adjustment process, it is recommended to adjust only one screw at a time and observe the movement of the chain to avoid over-adjustment.
In addition, you also need to pay attention to the tension of the transmission cable. The tension of the shift cable has a direct effect on the position of the rear derailleur. If the shift cable is too tight, it may cause the rear derailleur to shift position; if it is too loose, it may cause the rear derailleur to respond sluggishly. Therefore, when adjusting the rear derailleur position, also check and adjust the tension of the shift cable to ensure that it is within the appropriate range.
During the adjustment process, it is recommended to test ride and shift multiple times to check the matching of the rear derailleur and chain. If you find that the chain has problems such as skipping teeth, jamming, or abnormal noise during the shifting process, you should stop riding in time and conduct further inspections and adjustments.
Finally, to ensure the accuracy of your adjustments, use professional bicycle repair tools for measurement and calibration. If you are not sure how to proceed, it is recommended to seek help from a professional bicycle mechanic.
In summary, checking and adjusting the position of your rear derailleur is an important step in ensuring the smooth operation of your bike's shifting system. With proper adjustments and maintenance, you can extend the life of your bike and improve your riding comfort.