When heading about a curve, this possibly forces one of several wheels to slip, if possible, to equilibrium the evident distance protected, or results in unpleasant and mechanically stress filled wheel hop. To stop this, the wheels are permitted to change at different speeds employing a mechanical or hydraulic differential. https://4-434433.nizarblog.com/37932640/χειροκινητο-ρολο-καροτσασ-no-further-a-mystery