what types of bicycles can go up 45mph?

In the Tour De France they go faster then that on the descents. A bike with a full fairing has a speed record of 82.33 mph.

http://www.youtube.com/watch?v=PMUNOLwW0io
 
Everyone says downhill. But...track sprinters are faster than road sprinters. They can definitely go up to 45 mph in the track in a 200M sprint. They dive down from the banking, but I'm sure they can still do it without the bank. It just takes more time.
 
Just about any going down a steep hill with the wind.

Seriously, there are some custom built recumbents wrapped in a wind shell and powered by a superman that have gone much faster than 45.

No one has or could pedal a conventional bicycle that fast on a flat surface with no tail wind and no drafting assistance. 40 is apparently the fastest recorded, for a very short distance.
 
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