Originally Posted by
Lawrence08648
For a shorter person, you need a longer crank, not a shorter crank. A shorter crank you will need a longer leg, a taller person; a child is a short person with a short leg. A longer crank will come up higher. I'm assuming the seat is all the way down. Taller riders have longer cranks because they can generate more leverage plus it's to align their knees and the saddle. If the seat is all the way down and the distance is still too short to reach comfortably, then you need a longer crank that comes up higher.
I'm confused by having a longer crank for shorter person. Sure the crank will come up higher but the crank will be WAYYY down at the bottom of their power stroke. As the child pedals, their feet would leave the pedal as they push down because their shorter legs won't be able to reach the pedal on a longer arm at the bottom of the compression stroke.
A solution for shorter riders is to raise the crank centerline closer to the seat with shorter arms.