Bottom Bracket SummaryThe bottom bracket on a bicycle contains an
axle to which the
crankset is attached and the bearings that allow the
axle and
cranks to rotate. (The
chainrings and
pedals are attached to the cranks.) The bottom bracket fits inside the bottom bracket shell, which is part of the bicycle
frame.
There are currently a lot of different bottom bracket formats and, of course, there are compatibility issues between all of them. It's always wise to know what types of bottom brackets your
frame is made to accept and to know the type of bottom bracket your
crankset is made to interface with.
The key features needed to be considered when picking between bottom brackets are compatibility, stiffness, durability and resistance (less is obviously better).
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