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Derailleur hangar installation

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Derailleur hangar installation

Old 08-27-10, 10:38 AM
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wunderkind
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Derailleur hangar installation

Can someone school me on installing a RD hangar? Or better leave it to the LBS?
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Old 08-27-10, 11:12 AM
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On what kind of a bike or about some pictures ?
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Old 08-27-10, 12:43 PM
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There are hundreds of different models out there, so first be sure you have the right one. If you can't get one from the bike manufacturer, there is a web site devoted to nothing but derailleur hangers (https://derailleurhanger.com/)

Now, assuming you have the right one, installing it is trivial... unscrew derailleur, install new hanger. Having said that, the difficult part is that it also needs to be aligned (i.e., bent) so that the derailleur will line up with your cogs, and alignment is critical for good shifting. This requires a special alignment tool such as the Park DAG-2, so unless you have one of those handy...better take it to the LBS.

Last edited by jayp410; 08-27-10 at 12:54 PM.
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Old 08-27-10, 01:12 PM
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jayp410 - I wasn't aware of that. I've only had to replace the derailleur hanger on my mountain bike so far, but it just bolted on without any adjustment to it. I just had to adjust the limit screws in my derailleur which were now off because the hanger was now straight!
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Old 08-27-10, 01:44 PM
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You don't really need an airplane hangar for a derailleur - they're not that large. A small box will do
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Old 08-27-10, 01:46 PM
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You never know. It could be a REALLY big bike. Though I'm not sure Shimano makes a 1100 - 2500 cassette. Maybe campy....
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Old 08-27-10, 03:30 PM
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Originally Posted by Jon130 View Post
jayp410 - I wasn't aware of that. I've only had to replace the derailleur hanger on my mountain bike so far, but it just bolted on without any adjustment to it. I just had to adjust the limit screws in my derailleur which were now off because the hanger was now straight!
If it's not off by much it may not need alignment, but twice in the past couple of weeks (on a new bike, and when rebuilding an old bike) my hangers have been crooked enough that the derailleur would not reach the small cog regardless of anything I did with the limit screws, so the hangers definitely needed adjustment (bending).

Last edited by jayp410; 08-27-10 at 03:35 PM.
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Old 08-27-10, 06:34 PM
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Installing the replacement hanger is straightforward, but depending on how the original hanger failed you may need to re-align the dropouts. This requires specialized tools, particularly with indexed shifting.
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Old 08-27-10, 09:49 PM
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It is rare that you will need to align the dropouts. The hanger is designed to bend/break before the dropout. On all the occasions that I have had to replace a hanger, only a couple of times have I had to align the dropout. Usually only the hanger is bent. Sometimes the derailer is also bent. Hardly ever is the dropout bent.

Again, the replacement is easy, just screw it on. This is of course assuming you are replacing it on a bike that has a removable hanger.
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Old 08-27-10, 10:51 PM
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The replacement hanger also needs to be checked for alignment. 10/11 speed systems only tolerate a VERY small amount of error <5mm.
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Old 08-28-10, 05:51 AM
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Yeah, that's probably true. I usually only work on 9 speed and below. I'm not sure if I have ever needed to replace a hanger on a 10 speed. Usually it is on kids' 7 or 8 speed bikes for me.
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