Fig. 9

Example of the effects of force production on the handlebars on the steering moments and the rotation of the front wheel during asynchronous (left) versus synchronous (right) handcycling. Asynchronous: The depicted forces (blue arrows), e.g. both tangential, will both cause a steering moment in the counterclockwise direction (red), and consequently the front wheel will turn in the same direction. Synchronous: The depicted forces (blue), both tangential, will cause an opposite moment around the crank steering axis, in this case a counterclockwise rotating moment on the left and a clockwise rotating moment on the right (red). These moments cancel out each other, hence they cause no rotation of the front wheel