Although these aren't radio controlled,some of the newer kids riding toys come with a radio control so you can control it till your kid can do it themselves.This was from Instructibles.com.After you watch the videos in the build process click on the squares showing these being raced,to watch more videos. I suppose you could make one radio controlled if it wasn't already. http://www.instructables.com/id/Make...Jeep/?ALLSTEPS

Down hill racing http://www.youtube.com/watch?v=qNwtII91COY