Aaaahhh, the Knight Rider big wheel!!!! If I'm not mistaken, you could put one foot on the back axl, put your hands on the handlebars, and push with your other foot and it would make a loud clicking sound from the weight on the axl...which was really cool when you were 6.
The hand brake was the greatest thing about that big wheel. I got several lessons in physics when I'd be coming down a hill, hauling ass, and I'd just yank the hand brake. The thing is, it REALLY WAS A HAND BRAKE. If you didn't have enough speed, it would catch and instead of fishtailing sideways a la Dukes of Hazzard, it would flip you over and you'd fucking eat the pavement. But holy shit it was awesome even with a busted lip.