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how to fit a derailleur

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how to fit a derailleur插图

Installing a new derailleurStep 1 Mount the derailleur to the mounting bolt by turning it anti-clockwise then tighten it fully once it’s in place.Step 2 Put the chain back on.Step 3 Set the high limit and low limit screw. The high and low screws are meant to limit the derailleurs movement in either direction. …Step 4 Put the shift cable back into the derailleur. …

How to setup and adjust a rear derailleur?

Adjusting the rear derailleur. Step 1. Put the gear lever into top gear, turn the pedals and allow the chain to go onto the smallest cog on the cassette. If there is a cable adjuster on the gear …

What derailleur do I Need?

You’re running a tight ratio 13-26 rear cassette with 53/39 front chainrings – go for a small cage derailleurYou’re running a medium ratio 11-26 rear cassette and 53/39 compact chainrings on the front – go for a medium cage derailleurYou’re running a wide ratio 11-42 rear cassette and 52/36 front chainrings – you may need a long cage derailleur

How to adjust your front derailleur in 5 Easy Steps?

Typical Problems on Front Derailleur and How to Fix ItAdjust to the Correct Height. On the derailleur,you will find a long cage-like section called the derailleur cage. …Adjust the Limit Screws. The limit screws control the inner and outer boundary of your derailleur. …Clean the Front Derailleur. Sometimes there is a problem with the front derailleur because they are dirty. …Adjusting the Barrel. …

Can I install a front derailleur for my bike?

Can I add a front derailleur to my bike? As bikes have different width seat tube, your derailleur must fit it. If your frame tube is thin (and it looks that this frame has thin tube) you can take a little wider derailleur and put a holder plates between it and the frame.

What Tools Do We Need?

To get the job done right, we are going to need the right set of tools. To install and set up a new rear derailleur, we are going to need a set of allen keys, a phillips screw driver, cable cutters, chain break tool or chain pliers, and a pair of pliers. To get a closer look at what’s inside a pro tool box, check out our Pro Tool Box Check .

1. Remove Chain and Old Derailleur

Before we get started with the new derailleur, remove the old one and get it out of the way.

2. Mount New Derailleur

Before installing the new derailleur, make sure the current derailleur hanger is in good shape. Make sure that the hanger is visibly straight, has no stress marks or nicks, and that the threads are not damaged. If the derailleur hanger is damaged, the new derailleur will never shift like it should.

3. Install Chain

If you are installing a brand new chain, see our MTB How To: Installing A New Chain to make sure you set the correct chain length.

4. Set High Limit Screw

Now we need to adjust the high and low limit screws. These are here to limit the derailleur’s maximum movement in either direction so that the chain does not get thrown off the cassette.

5. Set Low Limit Screw

Repeat the same process described above to set the low limit screw. Use a 2mm allen key to adjust the limit screw.

7. Adjust Cable Tension

Now it is time to make some final adjustments so the chain is indexing through each gear perfectly.

Tools

For this job you’ll need a 5mm hex key for the derailleur’s mounting bolt, and a 2.5mm or 3mm hex key for the jockey wheels if you will not be removing the chain to clean or replace it. If you are removing the chain you may need a chain tool depending on your type of chain.

Rear Derailleur Removal

The first step is to shift your chain onto the smallest rear sprocket. Then pull off the shift cable’s end cap and loosen the cable pinch bolt. Remove the cable from the derailleur.

Rear Derailleur Installation

Before installing the new rear derailleur, apply some waterproof grease to the mounting bolt. Then thread it part way into the derailleur hanger, and rotate it clockwise to make sure the b-screw or tab is sitting behind the flat on the back of the hanger. Then fully tighten the mounting bolt.

Rear Derailleur Set-up

Now preset the high-limit (H) screw so the upper jockey wheel is roughly in line with the smallest sprocket when viewed from behind.

Discuss this topic in the Bicycle Repairs and Mechanics Forum

I purchased a used Trek Domane AL2 disc. The previous owner removed the front derailleur. I am trying to install a new one but am having an issue with the cable. When I try to pull the cable to apply tension before tightening, it is pulling the housing through the frame.

Removing an old derailleur

Besides cleaning a bike chain and tightening it, regular derailleur checkups should also be part of your bike maintenance routine. A well-adjusted derailleur should not make any noise. If you get any noise from the derailleur when shifting gears, then it may need to be adjusted.

Installing a new derailleur

Before you install the new derailleur, you have to ensure that its hanger is in top shape. Perform a quick visual inspection to see that the threads are not damaged in any way and there isn’t any other obvious damage. The last thing you want is to install a new derailleur on a damaged hanger.

Final thoughts

A rear derailleur is as crucial to a bike as brakes are to a car.

Tools

For this job you’ll need a 5mm hex key for the derailleur’s mounting bolt, and a phillips (+) screwdriver to adjust the derailleur’s limit screws and remove the derailleur cage bolt. If you are removing the chain you may need a chain tool depending on your type of chain.

Front Derailleur Removal

The first step is to shift your chain onto the smallest front chainring. Then pull off the shift cable’s end cap and loosen the cable pinch bolt. Remove the cable from the derailleur.

Front Derailleur Installation

Before installing the new front derailleur, apply some waterproof grease to the mounting bolt. Then place the clamp around the frame and tighten the mounting bolt just enough to keep it in place. At this point you still need to be able to move it by hand.

Front Derailleur Set-up

Now preset the low-limit (L) screw so the small chainring appears halfway between the derailleur cage when viewed from above.

Discuss this topic in the Bicycle Repairs and Mechanics Forum

I purchased a used Trek Domane AL2 disc. The previous owner removed the front derailleur. I am trying to install a new one but am having an issue with the cable. When I try to pull the cable to apply tension before tightening, it is pulling the housing through the frame.

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How many gears does my bike have?

To work out how many ‘gears’ your bike has, count the number of sprockets on your cassette.

Derailleur compatibility explained

Compatability across Shimano’s road and mountain bike groupsets is a little bit complicated.

Electronic groupset compatibility

They certainly aren’t the norm, but electronic groupsets are getting more popular each year.

What cage length derailleur should I buy?

Now that we’ve determined the speed, brand and compatibility of your derailleur, you must now determine the cage length that your drivetrain requires: long, short or medium cage.

Clutch derailleurs explained

Clutch-equipped rear derailleurs were once the sole preserve of mountain bike offerings, but are now seen on both gravel and road groupsets from Shimano and SRAM.

What do I get with a more expensive derailleur?

Now that we’ve gone through the tortuous process of working out exactly what will work with your drivetrain, you have the fun of deciding which price point to go for.

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