I have gone about 35 and I don't get much of a chance to do more around here, as it's pretty flat. I think it's just something you get use to. I'm sure if I lived in a hilly area I would probably do more. I use to race motorcycles when I was young and had a size 3 helmet, but I wouldn't do that anymore either. Probably an age thing. I crashed at 20+ as well and that's a very bad experience. Don't want to do that again.