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Issue with rear derailleur

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Issue with rear derailleur

Old 10-08-17, 08:24 AM
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jaris93
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Issue with rear derailleur

Hi guys,

My rear derailleur during up shift does not make a sound ( I usually ride on my large cog in the front derailleur and shift between 5,6,7 on my rear derailleur). When I downshift however it makes a sound as if the chain is striking the drivetrain.

1. I initially made sure my 7th gear(rear - smallest cog) and my 3rd gear (front - largest cog) are riding smoothly
2. I then downshifted (1 shift - 6th gear), loosened my barrel adjuster until i heard the chain strike the drive train. I then tightened the barrel adjuster until no sound was heard.
3. I did this till the lowest rear gear.
4. When i start to shift up again, i get back the sound on my 6th gear.

When I ride, and i need to go down from 7 to 6, i downshift twice, and up shift once to get rid of the sound.

I have no clue why this is happening. Any advice would be much appreciated.

Last edited by jaris93; 10-08-17 at 08:34 AM.
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Old 10-08-17, 10:09 AM
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alcjphil
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How old is the shift cable? A sticky cable can cause those symptoms
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Old 10-08-17, 10:25 AM
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The noise is continuous or only during the shift or possibly a few cranks after?

Have you been able to get the back wheel off the ground and watch as you turn the pedals by hand to see and hear?

Might be a sticky cable as @alcjphil mentioned or dirty DR mech not letting it travel all the way and the chain is trying to jump up to the next bigger cog. Watch for that if you can put it in a stand and see close up what is going on.

Although this statement confused me. It's seems to go against your other descriptions.
When I downshift however it makes a sound as if the chain is striking the drivetrain.
downshift meaning shifting the rear derailleur to a bigger rear sprocket? That puts tension on the cable so what I described above is likely not the fix.
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Old 10-08-17, 10:26 AM
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jaris93
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Originally Posted by alcjphil View Post
How old is the shift cable? A sticky cable can cause those symptoms
The bike is less than a year old. The cable seems to be in very good condition (I cant say how it looks inside).

I haven't touched the barrel adjuster on the shifter at all during my attempt to fix the derailleur. I have only adjusted the barrel adjuster on the derailleur.
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Old 10-08-17, 10:43 AM
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Originally Posted by Iride01 View Post
The noise is continuous or only during the shift or possibly a few cranks after?

Have you been able to get the back wheel off the ground and watch as you turn the pedals by hand to see and hear?

Might be a sticky cable as @alcjphil mentioned or dirty DR mech not letting it travel all the way and the chain is trying to jump up to the next bigger cog. Watch for that if you can put it in a stand and see close up what is going on.

Although this statement confused me. It's seems to go against your other descriptions.

downshift meaning shifting the rear derailleur to a bigger rear sprocket? That puts tension on the cable so what I described above is likely not the fix.


Thanks for your reply,

The noise is continuous after shifting. It does not happen when I shift up though (eg: 5,6,7). it only happens when i shift down the gear (7,6,5). So if i decide to go to the 6th gear from 7th, I downshift twice(5th) and shift up once just so that my gear doesn't make a noise.

Yes, my bike stand acts a lever to lift my bike off the ground. I turn the pedal and shift the gears 1 by 1 (its a bit difficult to see the casette when i do this, but from the sound i get it seems that the chain is striking the casette). I watched some videos done by parktool on how to fix the rear derailleur, based on the sound he gets and the sound i am getting it seems that the chain is striking the casette.

I washed my bike today and oiled the gears and chain (maybe i missed a spot?)

yes, downshifting meaning shifting from the rear smallest cog to the next larger size cog.
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Old 10-08-17, 10:48 AM
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the foundation to rear derailleur function precision, is the hanger alignment.

10 & 11 speed, indexed, more critically so, than 5&6, friction shift...
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Old 10-08-17, 11:01 AM
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Change the cable
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Old 10-08-17, 11:02 AM
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Originally Posted by fietsbob View Post
the foundation to rear derailleur function precision, is the hanger alignment.

10 & 11 speed, indexed, more critically so, than 5&6, friction shift...
Not sure where you are trying to lead us....

But I think you are essentially saying check that the derailleur hanger has not gotten bent. Likewise I suppose a bent or slightly twisted DR cage might be part of the issue.


No changes recently to the bike??
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Old 10-08-17, 11:13 AM
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jaris93
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Originally Posted by Iride01 View Post
Not sure where you are trying to lead us....

But I think you are essentially saying check that the derailleur hanger has not gotten bent. Likewise I suppose a bent or slightly twisted DR cage might be part of the issue.


No changes recently to the bike??
I was not aware about derailleur hanger alignment(and the tool used to do this, YIKES). I highly doubt its my cable though. My bike is an MTB so I take it on some rough terrain on and off I'm assuming this may have caused some misalignment somewhere along the line.

I have a feeling I may not be able to find a person to look at the alignment at the local bike stores in my country (hehe).
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