Originally Posted by jbhowat
Somewhere between 45 and 50 mph. At least for long road races (which usually see the pros driving ~30+ mph for a couple MILES leading up to the finish line... and that's after already hundreds of miles on the road).
Stage Four of the 1999 Tour de France averaged 50.355 km/h (
31.29mph) for 194.5 km (just under
121 miles).