The fastest I have ever gone was 31.5 miles per hour. It was downhill and I was pedalling like a madman. That was within a week or two of getting it and honestly it was probably a really bad idea. I had never ridden a bent before and I was scared to death. At the bottom of that hill was a railroad crossing which I did manage to slow down for. I routinely hit 30 miles per hour downhill now but I don't usually try to go anything faster than that.