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Old 07-11-09, 09:08 AM   #1
adlai
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chain gums up going backwards

but going forward everything is A-OK. eh?
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Old 07-11-09, 09:12 AM   #2
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We need more details on this one. Have a picture?
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Old 07-11-09, 09:14 AM   #3
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well, the best I can describe it is when I turn the wheel backwards, the chain will jump, and then get stuck on the rear derailler. This does not happen going forwards.

Also, shifting with the rear is making a weird squeaking sound.
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Old 07-11-09, 09:33 AM   #4
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Likely a stiff link in your chain. Find the spot where it "gums up" then use a chain tool and/or some lube to work the stiffness out of the link. Or just replace the chain.
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Old 07-11-09, 09:42 AM   #5
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Stiff link, or your chain is rubbing against your derailleur cage and getting caught up in it.
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Old 07-11-09, 09:49 AM   #6
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Has the chain been cleaned and lubed recently?
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Old 07-11-09, 11:14 AM   #7
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No, don't pedal backwards, that is all.

Due to the lack of a rear-derailleur on the top-run of the chain, when you spin the crank backwards, the chainline angle will try to straighten the chain. So if you're on the big cogs in back, it'll want to pull the chain towards the middle of the stack. Same if you're on the small cogs. This then causes the chain to be on a different cog than what the rear-derailleur's under and the chain will jump off the guide-pulley and jam.

Again, don't pedal backwards, it's a waste of energy and doesn't do anything for propelling you forwards.
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Old 07-11-09, 12:48 PM   #8
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this becomes an issue when I'm wheeling the bike backwards, and is just something I'm afraid might be a symptom of a larger problem.
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Old 07-11-09, 03:04 PM   #9
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Have the alignment on the rear-derailleur hanger checked at your LBS.
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Old 07-11-09, 03:19 PM   #10
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Originally Posted by Panthers007 View Post
Have the alignment on the rear-derailleur hanger checked at your LBS.
+1

Also check your freewheel or freehub and lube it if necessary.
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Old 07-11-09, 06:11 PM   #11
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this becomes an issue when I'm wheeling the bike backwards, and is just something I'm afraid might be a symptom of a larger problem.
Before pedaling backwards or pushing the bike backwards, put the rear-derailleur into the middle of the cog-stack beforehand. Spin it around a couple times and make sure the gear's engaged. Then go backwards all you want and the chain won't slip off.
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