The only way to decide that is to at least sit on one, if not test ride it. Sit on it, lean side to side, stand up, turn the bars all the way both directions. Lean front, lean back. If you can do all that comforably you're probably fine. I've seen pretty big guys on blasters, but i'm 5'11 200 and I feel a little cramped on a blaster. I can ride it without any problems, but after a while it starts getting uncomforable. I like to have a little room to stretch out and change riding positions, and for an average size adult rider the blaster is a little on the small side. The small size makes it easier to toss it around and make it do what you want though, so the small size isn't all bad.