How to Install a Rear Derailleur on a Mountain Bike: A Step-by-Step Guide
To install a rear derailleur on a mountain bike, first, shift the bike to the smallest rear cog and smallest chainring, then loosen the derailleur mounting bolt and attach the derailleur to the frame. Attach the derailleur cable and adjust the limit screws, which prevent the chain from shifting too far in either direction. Finally, adjust the cable tension to get smooth shifting between gears. Test the shifting by pedaling and shifting through all gears.