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Newbie has question: Why did my Rear Derailleur Bracket wear this way ?

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Newbie has question: Why did my Rear Derailleur Bracket wear this way ?

Old 01-03-22, 09:13 AM
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AJW2W11E
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Newbie has question: Why did my Rear Derailleur Bracket wear this way ?

Hello. I am new to Bicycling Repair. I have a Giant Mountain Bike with a Shimano RD M3000 Long Cage Rear Derailleur.
Can anyone explain why the Derailleur Bracket wore this way?
Thank you in Advance

The yellow arrow points to a notch worn by the chain

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Old 01-03-22, 09:20 AM
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In that big/big combo, something is keeping your jockey wheel to far from the cassette. You chain if it's not continuously rubbing that tab is at least too close to it and slapping it too much. Or is it just on the wrong side of the tab entirely? I'm having trouble deciding since the DR has several wonky things going on.

Do you have the b screw too far in? The jockey wheel should be much closer to the gears. At least mine always are.
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Old 01-03-22, 09:27 AM
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The chain is on the wrong side of the tab
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Old 01-03-22, 09:32 AM
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Originally Posted by alcjphil View Post
The chain is on the wrong side of the tab
That was my first thought. Bet the chain clattered a whole bunch.
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Old 01-03-22, 10:13 AM
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Oooops....
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Old 01-03-22, 10:23 AM
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Originally Posted by Iride01 View Post
In that big/big combo, something is keeping your jockey wheel to far from the cassette. You chain if it's not continuously rubbing that tab is at least too close to it and slapping it too much. Or is it just on the wrong side of the tab entirely? I'm having trouble deciding since the DR has several wonky things going on.

Do you have the b screw too far in? The jockey wheel should be much closer to the gears. At least mine always are.
I bought a new Derailleur, the same Model, to replace the worn one. I don't want to install it until I solve this issue. I'll try the B Limit Screw today
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Old 01-03-22, 10:24 AM
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Originally Posted by alcjphil View Post
The chain is on the wrong side of the tab
I don't hear clattering. It's pretty quiet. I'll see if I can find close up pictures of the Toughroad on the Web to see if its on the wrong side of the Tab.
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Old 01-03-22, 10:25 AM
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Originally Posted by AJW2W11E View Post
I bought a new Derailleur, the same Model, to replace the worn one. I don't want to install it until I solve this issue. I'll try the B Limit Screw today
You can solve the issue by routing the chain correctly on the original derailleur. The B screw isn't the problem

Last edited by alcjphil; 01-03-22 at 10:32 AM.
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Old 01-03-22, 11:15 AM
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Originally Posted by AJW2W11E View Post
I bought a new Derailleur, the same Model, to replace the worn one. I don't want to install it until I solve this issue. I'll try the B Limit Screw today
Follow the instructions in the Shimano DM's for that DR and you shouldn't have any issue. Pay close attention to any pictograms and be sure you understand what they are trying to tell you. Particularly on the chain routing and chain sizing.


https://si.shimano.com/api/publish/s...001-06-ENG.pdf
https://si.shimano.com/api/publish/s...001-24-ENG.pdf

Go here and put in the model of your shifters. The DM for them might be a little more detail for adjusting the shifting than the General DM linked above.

https://si.shimano.com/#/

At any rate, if the chain was regularly touching that tab, then that was your problem. You had it routed wrong. But your tab is on the backside of the DR and not the front side as mine is. So I'm really not certain from your pictures. But if you put the new DR on, and it touches any tab then you know it ain't right.
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Old 01-03-22, 11:21 AM
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Go look at a bike you haven't messed with for correct chain routing.
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Old 01-03-22, 10:48 PM
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Thanks for your help. That was embarrassing.
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Old 01-03-22, 10:52 PM
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Originally Posted by Bill Kapaun View Post
Go look at a bike you haven't messed with for correct chain routing.
My only other bike is a single speed, But everyone was right; the chain was misrouted. Thanks for the help.
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Old 01-04-22, 12:56 AM
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Originally Posted by AJW2W11E View Post
My only other bike is a single speed, But everyone was right; the chain was misrouted. Thanks for the help.
Nice to know that we were correct, can you explain how you figured that out? I only ask because I have been wrong in the past when I offered an opinion

Last edited by alcjphil; 01-04-22 at 01:01 AM.
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Old 01-04-22, 01:38 AM
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I’ve often wondered what the function of that tab is.

Does the tab have any purpose for the guiding/keeping the chain in the cage? I’ve never seen any marks on RD cage plate tabs.

Or, is it just to add stiffness to the cage plate?

John
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Old 01-04-22, 04:20 AM
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Originally Posted by AJW2W11E View Post
Thanks for your help. That was embarrassing.
Very easy to do. I bought a new bike where the chain had been placed the wrong side of the tab. It took me ages to work out why I seemed to have this curious vibration, more noticeable in some gears than others. I was pretty unimpressed!
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Old 01-04-22, 06:30 AM
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Originally Posted by AJW2W11E View Post
I bought a new Derailleur, the same Model, to replace the worn one. I don't want to install it until I solve this issue.
Looks like you now can just have it on the shelf for that someday you might actually need to replace the old one. Or replace it and keep the old one as a backup.
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Old 01-04-22, 06:32 AM
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Originally Posted by 70sSanO View Post
I’ve often wondered what the function of that tab is.

Does the tab have any purpose for the guiding/keeping the chain in the cage? I’ve never seen any marks on RD cage plate tabs.

Or, is it just to add stiffness to the cage plate?

John
The one function of that tab is to prevent the chain's coming off the tensioner wheel during shifts or while riding on rough surfaces. The longer the derailleur cage, the more likely the chain is to bounce off the tensioner wheel.
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Old 01-04-22, 11:22 AM
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Originally Posted by AJW2W11E View Post
Thanks for your help. That was embarrassing.
It happens. Shimano has even swapped the tab around on some derailers so that if you route it the “right” way, it’s wrong. Damn Shimano!
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Old 01-04-22, 11:27 AM
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Originally Posted by AJW2W11E View Post
Thanks for your help. That was embarrassing.
You're not the first to do this, and you certainly won't be the last.
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Old 01-05-22, 12:19 AM
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Originally Posted by alcjphil View Post
You can solve the issue by routing the chain correctly on the original& derailleur. The B screw isn't the problem
Thanks, its fixed.
I wish I was 30 again & 5 hours of sleep a night was ok.
I would have more time to tinker with bikes.
All I can do is muddle through because house repairs &keeping the family cars running gets first priority.

Last edited by AJW2W11E; 01-05-22 at 12:51 AM.
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Old 01-06-22, 10:05 AM
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I personally would have a longer cable housing from the boss on the chain stay to the rear derailleur, looks stretched.
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Old 01-06-22, 06:03 PM
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Originally Posted by Thomas15 View Post
I personally would have a longer cable housing from the boss on the chain stay to the rear derailleur, looks stretched.
Good eye. It is a bit short. Shouldn’t have a kink in it like that.
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Old 01-06-22, 06:41 PM
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Originally Posted by AJW2W11E View Post
Thanks for your help. That was embarrassing.
Whats embarrassing is I still can't see it... Rats!!!

Kinda like when the Grand Babies bring over those picture puzzles where you find a hidden item... Ha
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Old 01-06-22, 07:05 PM
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Originally Posted by cyccommute View Post
Good eye. It is a bit short. Shouldn’t have a kink in it like that.
Thanks I replaced the whole cable and I retuned the entire rear and...then I remembered how bad the front derailleur was shifting and I ordered the parts to fix that..only because of you guys on this Forum. Figured you guys were watching me down in the garage.


Last edited by AJW2W11E; 01-06-22 at 09:59 PM.
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Old 01-07-22, 03:26 PM
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Originally Posted by AJW2W11E View Post
Thanks, its fixed.
I wish I was 30 again & 5 hours of sleep a night was ok.
I would have more time to tinker with bikes.
All I can do is muddle through because house repairs &keeping the family cars running gets first priority.
Oh these days 30 years old nets you a couple young children and you have no time to play with bikes at all 😀.
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