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Old 07-14-06, 10:50 AM   #1
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jockey/guide sprocket bouncing off cog teeth


I have a problem with my rear derailleur that is pretty annoying, but I'm not sure if it's damaging or not. When the chain is on the smallest chainring, the jockey/guide sprocket (please correct my terminology if it's wrong... it's the little pulley gear on the rear derailleur closest to the casette) bounces off of the cog teeth. I have confirmed that it is not bouncing off because the derailleur is off-center respective to the cog, but that the guide sprocket teeth and the cog teeth are actually coming into contact (or so it appears to the naked eye). The rear derailleur is a Sora. I have attempted to adjust the b-tension screw by my LBS recommendation, but it didn't solve the problem, and because I bought my bike via mail order, they won't touch it. I'm not sure that there is anything else I can do to alleviate the problem, but one thought dawned on me this morning. Is it possible that this is happening because the chain is too short? For now, I have adjusted the limits on the front derailleur so that I cannot shift onto the small chainring inadvertantly. Can anybody recommend some possible solutions?


On another note, there's a clicking noise/feel and a little bit of a ping coming from my left pedal at about 10-o'clock on every pedal stroke, unless i don't apply any pressure. I haven't tried to address this issue yet, but I'm thinking the chainring, crank, bottom bracket, and pedals may need to be re-tightened. It's a brand new bike (all of 2 weeks old). Does it sound like I'm on the right track for that fix too?

Thanks again!

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Old 07-14-06, 12:43 PM   #2
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Right track but wrong direction. Your chain is probably too long. I had the same problem on my last new bike. I had to take out two links to make it work. When the chain is too long the cage of the rear derailleur swings back too far which moves the upper jockey wheel closer to the cassette. The chain sould be just long enough that you can shift onto the big, big combination with the rear derailleur almost streched all the way out. Be careful though, too short and the rear derailleur is toast.

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