I've been catching the Tour de France at night before I go to bed. It's amazing to see the speed these guys are going. First, they're riding hundreds of km's per day and secondly they're sustaining speeds I can barely hit.
Lately I've been pushing to see how fast I can get home from work. I did 5km in 8:46 (avg of 34.22 km/hr) and the other day I hit a new PB top speed of 57.5 km/hr (yes, a downhill was involved). Today I set a new best for my time home, 5km in 8:02 (avg of 37.34 km/hr). There was a great tail wind and I was running late, so I just pushed it the whole way. The bike makes an incredible sound at that speed. The tire hiss, the road is almost smoother and the pedaling feels effortless. But I couldn't keep that up for more than half an hour.
The Tour riders sustain speeds over 45km/hr for hours at a time. It's insane. Yesterday, in the rain, they were pushing 55 km/hr on flat ground at the end of hours on the road. How is that even possible?