Bicycle Bottom Brackets
Older style bottom brackets have solid shafts with square tapered ends. Both ends of the solid shaft have threaded holes allowing the cranks to be tightened down with a crank bolt. Older cranks must be removed with a crank remover.
Because bottom brackets have different shell sizes for different types of bicycles, it is important fit a bottom bracket to allow for sufficient distance between the crank set and the frame. Note, too, that triple chainring cranksets use a longer bottom bracket spindle than double chainring cranksets.
Shop for new and used bottom brackets and cranksets at eBay auctions.
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Bicycle Crank Sets and Bottom Brackets at eBay