What is a good average speed on a road bike?
The majority of riders can average around 15 mph. A good speed for a beginner is 10 mph, but you should be able to get to 15 mph pretty quickly. If you start training every once in a while, you could get your average up to 18 mph, but training on a regular basis could get you to 22 mph. Professional riders can easily average 25 mph during races like the Tour De France.