How to Easily Replace a Rear Derailleur on Your Mountain Bike
To replace a rear derailleur on a mountain bike, you need to first remove the old derailleur by unscrewing it from the derailleur hanger. Then, install the new derailleur by aligning it with the derailleur hanger and tightening it with the appropriate bolt. Next, adjust the limit screws and cable tension to ensure smooth shifting. Finally, test the bike and make any necessary adjustments until the shifting is working properly.