One thing I forgot to mention - not a problem w/ babies, but little ones who are mobile don't understand stuff that is too hot to touch - like wheels. My younger one touched the back of his finger to a wheel about 3 minutes after the car came off track. Poor bastard had a bubble the same size as his finger that evening. He was just out of reach as he pointed at something inside the spokes (an even hotter brake rotor?) and no one could quite get to him before it happened. Man that had to hurt but he only cried for about 5 minutes.