The excellent speed of cycling depends on different kinds of riders. For instance, competitive cyclists have a higher rate when compared to casual riders. However, on average, expert cyclists achieve 10-12 mph very quickly with limited training. More experienced ones can cover a medium distance, say 20-30 miles at 15-16mph. And a highly experienced cyclist could cover 40 miles at around 16-19 mph. So, it all depends on what kind of rider you are. It also depends on the slope you are riding on. If it’s rising, you will have to put extra effort to acquire a normal speed. On the other hand, while you ride down, it will pick up speed without paddling.