Mountainbiking

How to Adjust the bike front derailleur ?

If you have installed a new cable, cut off any extra and then attach a cable cap to the end. Crimp the end cap in place with pliers. One of the first things you need to do to adjust the front derailleur is to set limit screws so that the derailleur doesn’t move too far and push or pull the chain off the chain rings. There is nothing worse than hitting a steep hill, shifting to your smallest chainring, and having the chain fly off the chainring and become stuck in between the chainring and chainstay. A properly adjusted limit screw will ensure that the chain doesn’t go past the smallest chainring when shifting.

1. Shift the derailleur to move the chain onto the smallest chainring.

2. Set the L-limit screw so that the side of the cage closest to the bike is about 2mm outside the smallest chainring.

3. Shift the derailleur to the largest chainring.

4. Set the H-limit screw so that the cage plate farthest from the bike is about 2mm outside the largest chainring.

5. Try shifting between the two or three chainrings on your bike.

If the chain doesn’t not move easily to the appropriate chainring or it rubs on the side of the derailleur cage, you may need to make some fine-tuning adjustments.

6. To fine-tune the front derailleur, try increasing the tension using the cable adjuster.

On front derailleurs, this is usually located where the cable enters the left shift lever. Make quarter- to half-turns of the adjuster and recheck. You can also make small adjustments to the H- and L-limit screws to improve shifting or prevent the chain from rubbing on the cage.

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