5. How to Adjust Your Front Derailleur

Applies to most 3-chainring derailleur systems.
* Now with 3D interactive instructions

IMPORTANT: Nuts and bolts on your bike should always be tightened to the manufacturer's specifications.
How to Adjust Your Front Derailleur
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Today we’re going to learn how to adjust the front derailleur. Make sure that you’ve already set up your rear derailleur, as you will need to access all of your rear gears for this tutorial.

Front Derailleur Components

Front Derailleur

Height Adjustment

The first step is to adjust the derailleur’s height and angle using the positioning clamp that attaches the derailleur to your bike’s frame. This can be a bit tricky, since tightening the clamp’s bolt will set both height and angle at the same time. To make things easier, tighten the clamp so that it is secure, but loose enough to move it around with your hand.

Front Derailer and Chainring

For correct height adjustment, position the bottom of the derailleur cage as close to the largest sprocket teeth as possible, so that it still clears. Manufacturers recommend a 2mm spacing, but this is only meant as a general guide and not a rule. The lower the cage is, the better it will shift. While you’re in this position, take a quick look at the curvature of the large chainring and the outer derailleur cage, to make sure no part of the cage is rubbing on the chainring.

Angle Adjustment

The derailleur angle is set by looking down from above. This can be tricky and requires some patience, as the shape of the derailleur cage is often not straight. You’ll want to imagine a centerline in the middle of the cage, which should line up with the center line of your frame. Once the angle is correct, you can completely tighten the positioning clamp.

Limit Screws

There are two gear limit screws. On older derailleurs the low-gear limit is closest to the frame, but some newer models have reversed the screw's positioning.

Low Gear Limit

To adjust the low-gear limit, first make sure your chain is shifted to the largest sprocket in the rear, and the smallest sprocket in the front. The low-gear limit stop stops the derailleur from shifting past the smallest chainwheel and throwing the chain onto the bottom bracket shell. If it is too loose, the chain will fall off when you downshift to the small chainring. If it is too tight, it might not shift down at all. Ideally, you want to set up the inner plate so that it barely clears the chain in the lowest gear. However, triple chainrings like this one sometimes require a tiny bit of extra spacing.

High Gear Limit

To adjust the high-gear limit, shift the chain into your highest gear, that is, smallest sprocket in the rear, and the largest sprocket in the front. The high-gear limit prevents the chain from shifting past the largest chainwheel and throwing the chain out into your pedals. Ideally you want the cage to stop just after it clears the chain on the large chainring.

Shifting Adjustments

Now that both limit screws are set up, shift back to the largest sprocket in the rear, and the smallest in the front. Make sure your front shifter is in the lowest gear position, and pull the shift cable to eliminate any extra slack, before tightening the cable bolt.

Shift the front derailleur to the middle gear, and run through the entire range of rear sprockets to make sure the chain does not rub on either side of the front derailleur cage. If it does rub, you can adjust the trim by tweaking the barrel adjuster on your front shift lever. If you have an older friction shifter, often you will have to manually adjust the trim while riding.

This tutorial was based on the most common type of drivetrain, and assumes that you are using the components your derailleur was designed for. If you have a customized set of chainrings and/or derailleurs, you may need to try some different techniques, or even take your bike into a shop for further adjustment.

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Discuss this topic in the Derailleur Forums

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I just changed the Altus lever (ST CT-15) on a mountain bike that had been sitting in my basement for a while.
https://drive.google.com/file/d/0By-S838OebDHLVNvTDA2aGNFaWc/view?usp=sharing
https://drive.google.com/file/d/0By-S838OebDHa3JCcERhZHRZU0U/view?usp=sharing
Using the lever, I can't have the front derailleur move up or down (left or right) for an unknown rea... Read more >>

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Hello. I'm new to this message board - thanks for reading this.
I'm almost at my witts end with adjusting my wife's mountain bike. It's about 15 years old, Specialized brand 21 speed. Original Shimano shifters seem to be locked up - I've read that the grease hardens over the years. I tried loosening them up with Brake Clean spray, but to no avail.

I found a new pair of Shimano Shifters online (Amazon Prime) with very good reviews, so I decided to completely replace the ones that were on the bike.

The installation was easy, but adjusting the shifters - front ... Read more >>

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Hi guys,

I've followed these instructions
http://www.instructables.com/id/How-To-Properly-Adjust-The-Front-Derailleur-On-You
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05/26 Derailleur locked up

EDIT: RESOLVED

Hi,

I wonder if anyone can help with an issue I'm having with my rear derailleur.

I'm not really sure how to describe this but you can see here http://tinypic.com/r/2cwogbb/8 (direct images not working...). Basically when changing gears, the mech (which has recently been professionally fitted) locked up in the stretched out position and now I can't get it back. It has happened a few times before and released itself, but no joy this time.

Sorry if this is discussed el... Read more >>

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05/07 What if your new rear Dérailleur

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[Image: bike.jpg]
http://tinyurl.com/qdrsr3z

[Image: ke2.jpg]
http://tinyurl.com/mnroxc2

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here is a stock pic of the bike

[Image: MTX116BK.jpg]



*UPDATE*
I have found what one... Read more >>

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How to Adjust Your Front Derailleur
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