I'm looking for a DC Motor to power a small 50lb robotic platform with maximum speed of 10mi/hr. What should I be looking for? I've made some basic assumptions of 8" or 12" diameter wheels and so the rpm rating should 420 rpm and 300rpm respectively to attain 10mph. I plan to use at least two motors for steering capability so each needs to handle 25lb load max. What I'm looking for a commercial DC motor capable of driving the platform and its associated gearbox if needed. So far I've seen the Segway RMP which uses brushless DC motors but doesn't provide the spec for it. I figure it would be too powerful since the Segway platform is 200lb load capable.