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Old 06-01-05, 08:07 AM   #1
kritter
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Frame eats chain...why?

Im giving my old bike to my girl to ride and I gave up on using the small chain ring in the front long ago becasue the chain would just keep going around the ring and jam up in the frame. Well I told her to not use the granny gear and the first thing she does is drop it and jam the chain between the frame and the gear....

Everything looks straight. Is this from having an old chain on there? I ordered an sdram chain I believe and have not put it on yet. Will then new chain solve my problem? Does a worn out chain follow the gear instaed of go back towards the derailler?

Thanks for any help.
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Old 06-01-05, 08:37 AM   #2
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Thats called chainsuck and it drives me crazy! Sounds like your front derailer isnt setup correctly. So, when the bike shifts to the granny ring, the derailer cage is too far left which shifts the chain improperly and eventually causing it to fall off the ring.
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Old 06-01-05, 08:37 AM   #3
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Quote:
Originally Posted by troie
Thats called chainsuck and it drives me crazy! Sounds like your front derailer isnt setup correctly. So, when the bike shifts to the granny ring, the derailer cage is too far left which shifts the chain improperly and eventually causing it to fall off the ring.
Yeah, by the sounds of things the derailleur needs tuning.
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Old 06-01-05, 08:58 AM   #4
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What kind of bike is it? Some bikes are more apt to suffer from chain suck than others. I remember the older Gary Fisher Sugars were terrible about doing it. It seemed to help them by getting rid of the Bontrager crankset and change to XT or XTR. The Sugar 1 with the Race Lite crankset didn't seem to have as much problems with it.

Sometimes it is the frame design, sometimes it is the derailleur setting, sometimes it is the crankset. Sometimes it is all or none of the above.
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Old 06-01-05, 10:55 AM   #5
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A dirty chain will produce chain suck. Also, inspect your granny gear. If the teeth are worn, they may have little burrs on them. These burrs will "hold" the chain and produce the dreded chain suck problem as well.

One solution is to take a link out of your chain. This will add more tension to the rear derailleur spring and will sometimes alleviate the problem. You just have to check and double check that you have enough chain length available to remove a link.
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Old 06-01-05, 12:08 PM   #6
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Its an old aluminum trek 8000(from 93). Its got LX cranks and XT deraillers. I cant remember when/if the chain was replaced.
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Old 06-01-05, 11:51 PM   #7
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Sounds like a drivetrain checkup is in order. When an old chain is used too long the cassette and the chanrings are the next to get torn up
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