Originally Posted by
elcruxio
But a 4hour century would require a person to ride 40km/h for four hours. Actually faster if there are any uphills. That would require 300watts. 300 watts is almost pro cyclist doped up FTP ground. At least if you generate 6watts per kilo and weight 60kg. For a bigger rider it might be possible but uphills are then more of a battle.
Here's some good data on what it takes to do 40km/h / 25mph on a road bike. With aerobars, an aero road frame and deep section wheels you could probably get down to 240-250 watts. That assumes you can hold the aero position for 4 hours and you never stop to take a bathroom break. Solo it would be downright impossible without a full-on TT setup, pointy helmet and skin suit and even then it would be very hard outside of ideal conditions.
A 300 watt FTP is not that unheard of even among amateurs. Holding that power for 4 hours would require a 400+ watt FTP.
How aero is aero? - BikeRadar