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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 06-19-12, 11:18 PM   #1
Mayday.JP
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Converted bike, chain falls off

I'm posting this to inquire for my brother. I've personally never have had much experience with single speed bikes and my brother recently got an old peugot 9 speed bike and he took the gears off to make a single speed. He got the fixed wheel rear tire but the geared crankset stayed. The chain stays on fine but after a few mins or riding, it comes off everytime. We've tried tightening the chain, loosening it up but it falls off everytime. He's getting frustrated because he's had it for a few months and can't seem to fix it. Would the solution be to get a single speed crankset or is there something else we can try?

Also, he has the single speed chain he bought as well.

Thanks
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Old 06-19-12, 11:23 PM   #2
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Sounds like the front chainring is worn, and the chainline is probably off.
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Old 06-19-12, 11:38 PM   #3
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My first thought was chainline. Maybe try putting it on a different cog of the cassette?
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Old 06-20-12, 06:22 AM   #4
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Chainline it is.....
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Old 06-20-12, 07:08 AM   #5
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you might be able to get away with getting a bottom bracket that has a spindle length of around 110
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Old 06-20-12, 08:31 AM   #6
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If fixing the cabin line doesn't work, look at the chainring and make sure it not bent.

I don't think it's the frame, but it could be some serious flexing taking place. Are you guys sumo wrestlers?
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Old 06-29-12, 09:23 AM   #7
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Look up a chart which explains how many spacers you need to align chain. Also pics would help.
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Old 06-29-12, 09:36 AM   #8
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If fixing the cabin line doesn't work, look at the chainring and make sure it not bent.
Definitely the cabin line. I had a crooked cabin line once and it was a real ***** to deal with!
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Old 06-29-12, 09:49 AM   #9
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Cupertino from cbain.
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Old 06-29-12, 09:59 AM   #10
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what cog is he using? A good FG cog is designed so the chain stays on the cog. If you used a cog from a multi-speed cassette, it is designed for you to easily shift gears (not good if you only have one gear).
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Old 06-29-12, 11:29 AM   #11
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Quote:
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If fixing the cabin line doesn't work, look at the chainring and make sure it not bent.
Check the spindle too -- see if the chainring wobbles left to right at all when you spin the crank. My old bike had a slightly bent spindle, and the chain went from overtight to a bit too slack in each turn of the crank.
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