1. The problem statement, all variables and given/known data I'm designing a tyre test rig for a university project to measure camber, slip angle etc. An example of a test rig - http://www.ika.rwth-aachen.de/forschung/veroeffentlichung/1999/30.06.-02.07/im173g.gif [Broken] Although my test rig will be for an RC car tyres, so not quite the same size... The tyre will be connected to a motor which will induce deceleration (as a generator) or acceleration and i'm trying to figure out how I would be able to work out or what parameters I would need to determine the torque required by the motor. My idea is that the motor will need to overcome the force induced by the rolling road (in this experiment it will be a belt sander) Any kind of feedback or help will be appreciated!