Many years ago I built a sprint car for my son with a roll cage and all, it would go 23mph and my son had a ball on it, it started out as a mower but the frame was a lot more sturdy than what they are now, when he out grew it we took off the motor and gave it to some kids that really admired it and they would push it all over the place taking turns riding, they didn't care that there wasn't a motor. Oh, by the way, you would sit down much lower than before and not as high as the mower seat was which made it much more stable.