Riding a bike for 10 miles on a Sunday afternoon is not rocket science.
Riding in professional race requires a great deal of skill and tactical knowledge. You need to know when to really put in the effort, you need to understand and/or motivate your team, you need to figure out how much you opponent has left in the tank, you need to know how hard you can push it without blowing up, you need to be able to descend a mountain at 50-60mph....
Football is about more than brute strength. Tennis is about more than having a good backswing. Cycling is about more than raw endurance.