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Pedals
and Crankset
In bicycles, and many human powered boats and aircraft, pedals
couple the
rider
to the rest of the power train. In this section, the bottom bracket, crankset,
pedals, and chain wheel(s) will be considered as a system designed to maximize
this power transfer with the minimum of energy loss.
The photograph
shows a Zipp pedal on a carbon fiber crank that is coupled to the chain-wheel.
The shaft supporting the pedal has low friction bearings and a similar
configuration is used in the bottom bracket to minimize the work from
the rider lost to friction. Traditional pedals have had cup-cone bearings and
the pedal structure is of light metal construction with a cleat or clip to engage
the riders shoe. Other pedals may have a non-slip metal or rubber- type
surface that holds the shoe in place by frictional forces or uses a special
fastener attached to the shoe. |
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