FAST. There was some dude on a road bike about 200 yards ahead of me on the MUP, and I needed some exercise, so I chased. Took me a couple of miles to barely catch him before we went different ways. Almost blew up. 22-25MPH most of the way. I do feel pretty strong though. 45 pound dualie MTB with all terrain 26x2.1 tires. Maybe I need a road bike.