The part of your bike that contains the axis the cranks arms spin 'round. (The crank arms are where the pedals attach.)

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Claud Butler Tandem - transmission issues

I'm in the process of stripping a SWB Claud Butler tandem so I can get it repainted. There are a couple of things I need help with.... a) Can you fit a front mech to the bike, and if so, are there ...
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Raleigh AT20 series bottom bracket affects derailleur

I took out the bottom bracket to clean it etc taking off the pedal shafts etc - and when it came to putting it back - the front derailleur was well out of adjustment - Have I done something wrong>- ...
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Where can I find a square tapered bottom bracket for my TREK Navigator 200?

I have the crank puller and bracket remover but finding the bearing assembly is daunting. I took it to the bike shop (not where the bike came from) and they took 2-weeks to order the part. I'm not ...