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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 06-04-03, 02:12 AM   #1
cooly
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tasty brighton clanger!!!

I was into cycling along the seafront last night and decided to race a friend kind of freestyle, but unfortunately the rear end of my marin palisades kicked out, i came off and somehow, unsure how this happen, broke the spindle thing which i think is the bottom bracket, i have looked up the spec and believe it may be a cartridge sealed bracket. I am hoping this is easy to fix, although believe it may need a bike fixer to rectify.
The whole bit has loose, to say the least, need to find out more?
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Old 06-04-03, 09:07 AM   #2
mechBgon
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Ouch!

The axle/bearing set that the cranks rotate on is indeed the bottom bracket. To replace it, you would do like this:
  • Use an 8mm hex key to remove the bolts that hold the crank to the axle
  • Next, use a crank extractor to push the broken piece of axle out of the severed arm
  • Use the crank extractor to remove the other crankarm from the bottom bracket
  • Use a splined bottom-bracket tool to remove the bottom bracket from the frame
  • Determine the size of the bottom bracket, which will probably be marked on its shell (68 x 113 or what have you)
  • Get a replacement bottom bracket, grease the threads of the frame and the bottom bracket, and install it using the splined bottom-bracket tool
  • Rub a dab of grease into the flats of the bottom-bracket spindle, grease the 8mm-hex bolts, and install the crankarms
  • Do a test ride and see if the crank that took the hit feels bent
You can find illustrated instructions for the bottom-bracket removal/installation at Park Tool's site here, and for the crank removal/installation here. If you'd rather have your local shop do it, it will cost you less in labor than it would cost to buy the necessary tools. Hope that helps
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Old 06-05-03, 01:15 AM   #3
cooly
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Many thanks mechBgon, that is a great help, cheers
cooly
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