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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 12-01-05, 11:52 AM   #1
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bottom bracket too narrow?

I bought a new bike (Cannondale Synapse) recently and I can't adjust my front derailleur in enough. It bottoms out against the frame and the chain rubs in some gears. I didn't like how the LBS that I bought it from put it together, so I took it to a shop recommended by members of my club. The mechanic at the recommended shop told me to have the bottom bracket replaced with a wider one to allow more adjustment. Does this sound right? If so, should I ask the shop where I bought the bike to replace it since the original didn't work?

Thanks, Plosive
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Old 12-01-05, 11:57 AM   #2
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Sounds logical to me. Sometimes aluminum framed bikes that have fat seat tubes require a slightly wider bottom bracket. Otherwise the front derailleur will bottom against the seat tube before it can pull the chain over far enough to engage the granny chainring.
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Old 12-01-05, 12:03 PM   #3
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That is a trouble we had with CDale way back in '94, you would think they would have started putting a little dent in the seattube right where the der touches like many other makers do now.
I would try the shop you got it from, as it should be free: New bikes are supposed to work right.
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