I guess I would have to say that I am an endurance type. My problem is that I have done no riding in a place that is really flat. I can maintain 17-19 mph during the few places/times I have been on a real flat, but it's never been more than 15-20 minutes. Most of my riding is at an average of just under or at 15 when I'm by myself or with my husband. This includes rollers and small climbs. If you add in bigger hills, my average goes down to about 14 or 13.5. There are some good climbs and hills around where I live. The highest grade I've gone up is 20 %, in Vermont. It was short, though. I've done a few 15 % ones, too. Most of the time on big hills, I'm going around 6-8 mph. On shorter or less steep climbs that I am familiar with, I might get up to 12. I hate descending, I feel like I'm going to crash every time, especially if it's curvy! My fastest has been at 32. My depth perception sucks and I know this has something to do with the feeling I get going down a hill. I feel the same way when I drive in an unfamiliar spot.