Question

Can someone please help me with this

What is the crank on a
bicycle and what two
factors are used to
determine the optimal
crank length for a particular
rider? How would this be
different for hand-powered
vehicles?

Answer 1

The key principle is that crank length, just like frame size, should be proportional to the rider height and then modified to what fits the individual. There are 4 charts, two for the upright position and two for the aero position, depending upon how you race.