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A diagram
shows a transverse section of a bottom bracket. This assembly is situated
at the base of the triangulated bicycle frame. The central spindle carries
the pedals and the crankset which are attached to the chain wheel. The spindle
runs in two adjustable cup/cone bearings which are lubricated and adjusted
to provide stability to the shaft while minimizing bearing friction. This
design is self aligning which is an advantage from the manufacturing point of
view. In some bikes, sealed bearings replace this cup-cone design.
The
cranks are fixed to opposite ends of the bottom bracket spindle at a relative
angle of 180 degrees. Traditionally, the right hand crank carries the chainwheel(s)
that will transfer the power to the rear sprocket via the chain. |
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