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?
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