There are two things that might cause safety concerns. One is your inseam, whether you can get your feet flat on the ground. It´s a heavy bike, you don´t want to be balancing on tippy-toes. The other is that if it´s got a windshield, you want to be able to have a complete field of vision over the top edge without raising your bum off the seat. The interstate fairings have a rather tall windshield, but I think mine looks kind of dorky so I´m thinking of shaving it down a few inches. I´m 5´10 and I´d guess that I have about 6\