Interesting. There's a hill on Mackinaw Island which is marked, "No Coaster Brakes." It's some ungodly grade. As I was climbing it on my upright, a horse and cart were going down. The horse basically had its feet out in front and was skidding slowly down the hill. I didn't make it to the top, at least not on the bike. I stripped the freewheel off the hub trying, though. One more reason to like cassettes.