How to Easily Fix a Front Derailleur on Your Mountain Bike
To fix the front derailleur on a mountain bike, first, shift the chain to the smallest front chainring and the largest rear sprocket. Then, loosen the cable tension bolt and adjust the height and rotation of the derailleur so that it is aligned with the chain. Finally, tighten the cable tension bolt and test the shifting to ensure it is smooth and accurate. If necessary, adjust the limit screws to prevent the chain from over-shifting.