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Is my RD bent ?

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Is my RD bent ?

Old 10-11-21, 03:47 AM
  #1  
dirtydozen
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Is my RD bent ?

Hello,

The ****fing on my RD is not working well, sometimes one click down does nothing, and the next click down goes from cog 3 to cog 1 let's say, it skips a gear.
I have a triple chainring and when in the middle one (i never use the smallest one) and smaller end of the cassette it just does crazy stuff and it's unridable.
I struggle to index the RD even though it's something that usually I can do quite easily.

My RD seems bent and I think this is the reason causing all this, the bend is slight but I guess this is precise machinery.
I wanted to have confirmation of you guys before I get a new RD.

Thanks!



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Old 10-11-21, 04:09 AM
  #2  
Badger6
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More commonly, the derailleur hangar (the metal bit that bolts to the frame, that the RD bolts onto) is what gets bent. Yes, slight-as in not discernible without a special tool-bends in the hangar can lead to what you're describing.
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Old 10-11-21, 05:38 AM
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Possible issues:
1-Your chain and cassette are worn and need to be replaced. Start by checking the chain for wear using a chain checker tool.
2-Your derailleur hanger is bent and needs to be aligned.
3-Your shifter cable needs to be replaced. Try to isolate it by disconnecting it and see if you feel drag.
4-The high limit screw needs to be adjusted on your rear derailleur.
It may be a combination of some of the above.
PS: your chain looks very dry and in need of lube.
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Old 10-11-21, 08:15 AM
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First try cleaning and lubing the shifter cable, and start with the rear loop at the derailleur. And since you don't have a cable tip, you're going need a new cable to do that. And you might as well replace the housings when you do that. And clean and check the shifter as well.
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Old 10-11-21, 08:49 AM
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Options….
1. Buy the hanger alignment tool.
You’ll use it more often than you think.
And your buddies will bring you beer!

2. Take bike to shop. Wait X number of weeks.

3. Remove chain, remove derailleur.
Roll bike into store and beg!
If you pass the attitude test and don’t require them to reassemble and adjust the bike, it’s a 5min fix.
pay in cash!

4. Bring buddy that has the tool….. beer.


Barry

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Old 10-11-21, 09:21 AM
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It sounds like your RD hanger may be bent. You can make an alignment tool from an old axle and a paint stirrer stick, or use a wheel with an axle that protrudes far enough to screw into hanger, and also provides plenty of leverage to bend the hanger until the two wheel rims are parallel. Don't bend the hanger any more than you need to; they will break if pried back and forth too much.
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Old 10-11-21, 09:57 AM
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Originally Posted by Barry2 View Post
Options.

Forgot to mention.....

NOT an option... buy and install new hanger.
Even brand new hangers require alignment to suit your frame, when first installed.

Barry
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Old 10-11-21, 02:29 PM
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Originally Posted by dirtydozen View Post
Hello,

The ****fing on my RD is not working well, sometimes one click down does nothing, and the next click down goes from cog 3 to cog 1 let's say, it skips a gear.
I have a triple chainring and when in the middle one (i never use the smallest one) and smaller end of the cassette it just does crazy stuff and it's unridable.
I struggle to index the RD even though it's something that usually I can do quite easily.

My RD seems bent and I think this is the reason causing all this, the bend is slight but I guess this is precise machinery.
I wanted to have confirmation of you guys before I get a new RD.

Thanks!
Nothing wrong with the RD that I can discern from the pics. I'd put money on the problem being your cable. Replacing the housing and inner cable would be a cheaper first step before placing the RD and hanger. Not to put too fine a point on it, but what little of your cable I can see looks pretty gnarly
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Old 10-11-21, 06:19 PM
  #9  
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Hanger IS bent. While you are at it, change the cable, and clean the drivetrain. You can use a wheel (old school one with threads) as a hanger tool. I'm gonna be wrenching FT now that I'm retiring from the Navy.
ps: The Abbey hag tool is nice.
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Old 10-11-21, 09:24 PM
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your chain is dry, clean it, lube it.
your RD is dirty, clean it, lube it. Make sure the pulleys are clean roll easy and the upper pulley has a little side to side play.
your cassette is dirty, clean it.
your B-screw is screwed in to far, pulling the upper pulley to far away from cassette, adjust it.
if you pull you cable out or off, replace it, if not make sure tension is good.

if this has come gradually without any external reason (i.e. wreck), then it is usually a maintenance issue. RD
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Last edited by canopus; 10-11-21 at 09:27 PM.
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Old 10-12-21, 11:34 AM
  #11  
dirtydozen
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Thanks a lot everybody!

Actually I bought cables a couple of days ago because clearly I need to clean & lube and put a brand new cable in.
I made this post basically to know if I had to do all that and see if it's working, of if the RD was the problem meaning that if would have to be replaced anyway.

I'm quite busy with work at the moment but i'll do everything you guys suggested in a near future and let you know how it goes!

Thanks again everybody for the help
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