Hello PF, A friend and I are building a rather cool Gokart with regenerative braking and UltraCapacitors etc... Instead of using conventional mechanical steering we plan on using stepper motors for a makeshift power steering system My question is I cant figure out the required Torque/Force the motors need in order to turn the wheels at rest. I know that as your speed increases you need less force to steer so if I calculate for rest I can cover everything. I know my calculations need to include: Coeffecient of Friction and Normal force, and that torque = radius * force, but I dont know which radius to use. The weight of the kart is about 400lbs with the majority at the back with the motors etc.. Any help would be much appreciated.