A crank arm for a pedal-driven vehicle is described herein. The crank arm includes a first member that pivots about a crank axis of the pedal-driven vehicle and a second member rotationally coupled to the first member and configured to receive a pedal. The crank arm further includes a spring assembly configured to bias the second member towards a neutral rotation configuration relative to the first member and to resist rotation of the second member away from the neutral rotation configuration, wherein a distance between the crank axis and the pedal interface is greater than a distance between the crank axis and the member pivot point when the second member is in the neutral rotation configuration.