WOLFRAM|DEMONSTRATIONS PROJECT

Five-Bar Linkage Model of the Bicycle-Rider System

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anthropomorphic parameters
shank length
44
thigh length
43
foot length
16
bike geometry parameters
crank length
17
seat tube length
71
seat tube angle
73°
crank angle
0.
°
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This Demonstration models the motion of the bicycle-rider system by a five-bar planar linkage with the crank axis and the hip as fixed joints; the pedal, ankle, and knee are moving joints.
If we take the foot angle as a function of the crank angle, we end up with the crank angle as the only degree of freedom.