<human>:  How do I adjust my new bike derailleur?
<bot>: First, you need to check your bike's manual to get specific instructions on how to adjust your new bike derailleur. Generally, you need to adjust the height or tension of the derailleur with a hex wrench or a screwdriver. You also need to check the cable tension and route the cable around the derailleur before adjusting. Once finished, you can adjust the limit screws so that the chain moves smoothly between the different gears. Finally, double check to make sure that everything is in its proper place before riding your bike.