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Rear Derailleur Hanger Chain rub

Old 11-13-20, 12:21 PM
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Chainringz
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Rear Derailleur Hanger Chain rub

Hey guys,

new to the forum. Really appreciate all the info here but I haven't found the right combination of the issue I'm experiencing atm. I have a 1x10 setup and I get a lot of chain rub at the middle hanger portion of the rear derailleur. I guess you would call it a cage plate? It's between the 2 pulleys and it guides the chain. Whereas I've seen plenty of bikes without the guide plate for the chain. I mostly see chains guided buy the pulley and cage. I'm not sure if this is normal for the bike or not but it seems like it would eventually cause issues with the derailleur. My guess is the chain is too short? When going to the biggest cassette ring the derailleur seems reallllly tight hence the rub. Enough that it seems that it is causing friction when I ride. Doesn't seem bent or anything. Is this normal and am I being a setup snob?
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Old 11-13-20, 12:32 PM
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Gonna have to splain more. I can't make out what you are trying to describe.
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Old 11-13-20, 01:21 PM
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What you are calling the cage plate, is that on the rear DR with the two little cogs in it?

And you say the chain is rubbing on that. More so when in the middle range of cogs on the back? I'd have to think it's your DR hangar being ever so slightly bent. Did the bike fall on that side or get hit maybe?

Might be your indexing being slightly off and just needing some turn or two of the barrel adjuster. But that would be more the chain scrubbing on the cassette cogs.

Is this something cobbled together or everything original?
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Old 11-13-20, 01:21 PM
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There's a metal tab located "between the 2 pulleys" - a common mistake when installing a chain is threading it outside the tab instead of the chain running directly from one pulley to the other, so it rattles off the tab. Lots of people make this mistake - usually only once.
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Old 11-13-20, 01:22 PM
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Is the chain threaded through the derailleur pulleys correctly? It needs to go in front of the top pulley and behind the rear one. https://www.sportsrec.com/487240-how...erailleur.html
Another possibility is that the B-screw needs adjustment.
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Old 11-13-20, 02:09 PM
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I think @Litespud is closest to the issue I'm having. There is a tab that seems to guide the chains but I don't think its suppose to create so much tension that it creates noticeable friction when pedaling. I take it adding a link or 2 may help this? I had pictures ready to show you guys but didn't know I had to have 10 posts up to put a picture up. The chain is routed correctly, in front of the top one and behind the lower one. This is hard to explain because alot of hangers don't have this "guide". Not sure what the use for it would be anyways other than to irritate me lol.
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Old 11-13-20, 02:15 PM
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Originally Posted by Iride01 View Post
What you are calling the cage plate, is that on the rear DR with the two little cogs in it?

And you say the chain is rubbing on that. More so when in the middle range of cogs on the back? I'd have to think it's your DR hangar being ever so slightly bent. Did the bike fall on that side or get hit maybe?

Might be your indexing being slightly off and just needing some turn or two of the barrel adjuster. But that would be more the chain scrubbing on the cassette cogs.

Is this something cobbled together or everything original?

Salsa Timberjack Deore 27.5+ all orginal parts. Cranky's bike shop has the exact bike that I have
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Old 11-13-20, 02:23 PM
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Originally Posted by Chainringz View Post
I think @Litespud is closest to the issue I'm having. There is a tab that seems to guide the chains but I don't think its suppose to create so much tension that it creates noticeable friction when pedaling. I take it adding a link or 2 may help this? I had pictures ready to show you guys but didn't know I had to have 10 posts up to put a picture up. The chain is routed correctly, in front of the top one and behind the lower one. This is hard to explain because alot of hangers don't have this "guide". Not sure what the use for it would be anyways other than to irritate me lol.
If you are talking about the tab...the chain is routed wrong. It's not supposed to be on the outside.
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Old 11-13-20, 02:54 PM
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Originally Posted by Chainringz View Post
I had pictures ready to show you guys but didn't know I had to have 10 posts up to put a picture up.
You might need ten posts to upload a pic but you can write the URL to get to your pics in the plain text of your message. Don't try using the link or image tools.

You'll probably have to remove the https:// and change the "." to " dot ". We'll figure out the rest. If the hosting site is one you have to sign in to, then make sure to use the link they provide via the Share button.
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Old 11-13-20, 03:30 PM
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Originally Posted by Chainringz View Post
I think @Litespud is closest to the issue I'm having. There is a tab that seems to guide the chains but I don't think its suppose to create so much tension that it creates noticeable friction when pedaling. I take it adding a link or 2 may help this? I had pictures ready to show you guys but didn't know I had to have 10 posts up to put a picture up. The chain is routed correctly, in front of the top one and behind the lower one. This is hard to explain because alot of hangers don't have this "guide". Not sure what the use for it would be anyways other than to irritate me lol.
email the pics to me: (davetspokane1@comcast.net) and Iíll post them here for you. Remove the ( ) for my link.
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Old 11-13-20, 05:01 PM
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Originally Posted by Davet View Post
email the pics to me: (davetspokane1@comcast.net) and Iíll post them here for you. Remove the ( ) for my link.
Will do, Thanks Dave!
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Old 11-13-20, 05:24 PM
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Originally Posted by jadocs View Post
If you are talking about the tab...the chain is routed wrong. It's not supposed to be on the outside.
It's the side closest to the pedals
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Old 11-13-20, 05:33 PM
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Originally Posted by Chainringz View Post
It's the side closest to the pedals
The chain needs to be routed inside the tab...It should make contact ONLY with the two plastic wheels that are part of the derailleur.
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Old 11-13-20, 05:49 PM
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Here’s the OP’s pics. I’ll echo what others have said, the chain is not supposed to ride on that tab. The chain goes on the other side of the tab, directly from the top pulley to the bottom pulley.



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Old 11-13-20, 09:28 PM
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The chain is routed like this, NOT across the tab.

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Old 11-15-20, 09:16 AM
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Thank you guys for all the help.

In the picture that I circled with blue I just want to make sure we are talking about the same piece here. There is a little plate that the chain is sitting on. I believe the tab you are all talking about is the Philips head tab that is sticking out which is currently not going through to the other side its just on the side of the cage. I believe in your picture you don't have the little plate that the chain rests on. Maybe you would consider my derailleur a long cage? In any case, my chain should be on the other side of the plate that is shown in the circled pic in the pics you posted up for me?
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Old 11-15-20, 10:06 AM
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From the Shimano Manual. As mentioned already, looks like the OP's chain is routed wrong.




Last edited by Crankycrank; 11-15-20 at 10:11 AM.
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Old 11-15-20, 10:29 AM
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Chainringz
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Man am I glad I didn't have my chain pop on me when I was out on a mountain!!!! Thanks guys I'm going out to fix that now and see how it rides! You guys rule
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Old 11-15-20, 12:52 PM
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Chain is rerouted and working great now. Probably why the guy that sold it to me didn't like it... lol
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Old 11-15-20, 12:55 PM
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Now I can Post my own pics!!

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