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Installing a rear shimano derailleur, maybe installed incorrectly?

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Installing a rear shimano derailleur, maybe installed incorrectly?

Old 08-26-17, 10:21 AM
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Honda_03
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How I installed this Shimano rear derailleur incorrectly?

Hello first time posting. Am wondering if I installed a Shimano rear derailleur wrong. The cog pointing away from the bike seems to be rubbing up against the bottom of the derailleur. The top cog doesn't do this. Wondering what I have done wrong and how I can correct this. Also I have a new bike chain and am comparing it with my old bike chain. Is the idea to pop the new chain at the same distance of the old chain. So in effect giving the same length of both chains?

Here is a link to the pictures:

imgur.com/a/dFgTE

And bike chain:
imgur.com/a/31zkB

Thank you!
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Old 08-26-17, 10:33 AM
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Installing a rear shimano derailleur, maybe installed incorrectly?

This is for a Schwinn ranger 26"

Hello first time posting. Am wondering if I installed a Shimano rear derailleur wrong. The cog pointing away from the bike seems to be rubbing up against the bottom of the derailleur. The top cog doesn't do this. Wondering what I have done wrong and how I can correct this. Also I have a new bike chain and am comparing it with my old bike chain. Is the idea to pop the new chain at the same distance of the old chain. So in effect giving the same length of both chains?

Here is a link to the pictures:

imgur.com/a/dFgTE

And bike chain:
imgur.com/a/31zkB

Thank you!
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Old 08-26-17, 10:34 AM
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Bluechip
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I can't see your pic but I would bet that you routed the chain over the metal guide tab between the jockey wheels instead of under it. To fix you would need to break the chain again and route it correctly or remove one of the jockey wheels to reroute the chain.
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Old 08-26-17, 11:23 AM
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My best guess from your description and my lack of clue is that with the original chain you find that when you are 'small small' the original chain is rubbing on the top jockey wheel. It looks like you have installed new jockey wheels as well.. they or rather the original hardware have not yet rusted. If that is the case I do not understand why you did not take the opportunity to clean up the rest of the rear dérailleur.

Assuming the rear dérailleur has the range to deal with the teeth differential, someone else can explain that, then rumour has it that you ignore the rear dérailleur and stick your new chain on over 'big big' and add two links or an inch... someone else can explain or correct me on that one.

Blah Blah Blah.
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Old 08-26-17, 11:43 AM
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Pictures don't work. Your best bet is to YouTube replacing rear derailleur and chain. Park Tool has good tutorials.

John
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Old 08-26-17, 12:06 PM
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Bill Kapaun
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Your picture is too close to see the "forest"
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Old 08-26-17, 12:16 PM
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The links work for me. For length double check the old chain it's probably right but you never know.
To check length thread the chain big to big not going through the derailleur.


If your question about rubbing is without the chain as in the pix you posted the chain will hold that away when it is in place.

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Old 08-26-17, 12:25 PM
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Thread moved from General Cycling to Bicycle Mechanics
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Old 08-26-17, 12:40 PM
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Duplicate threads merged.
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