Due to my recent knee surgery, I haven't rode in almost a month, so I'll try my best to remember what rpm it cruises at. I think 75 mph is around 6500 or so. It really starts buzzing at that rpm. Like I said, I could just gear it higher and probably not have that problem. The other problem is its such a light bike that it blows around pretty easily when there's a crosswind or semi truck going by. I've nerver tried two up, so I don't know how it does for that.