I had the Circus car when I was a kid.Great stuff -- reminds me of my early childhood!
My Dad said I literally rode the tire down to the rims on mine.Imagine being a small child at the time they came out, you'd be the envy of the street! Maybe even your school! All would go well till the local bully (who had usually eaten too many sweets every day) would push you out of it to have a go and probably break it!
They are so damn cool! I've seen a few on TV shows and always like them.