Trickymac
Likes Dirt
i concur...sage advicejust to add on to this.
lets keep in mind that elite riders do train for sprints, they do train different aspects and they hit the gym, there is also a point where you will need to improve muscle size to improve performance, there is a lot you can get out of a muscle in terms of density and improvements in the firing of said muscles but there is a point where you are limiting your potential, you would be hard pressed to find a elite rider who doesn't periodize a time for muscle mass.
Riding alone will not give you the same size as Cadel, it just wont happen, long distance riding or sprints don't offer the right stimulus to yield size growth to that level, newbies will gain size but its not a long term or viable way to try and add size. hill climbs and sprints both offer higher levers of stress over a shorter period of time. These practices do increase size but you cant expect cadel results on a bike only.
sprinters do not just do sprints on the bike and climbers just don't climb hills all day, there is lots of off the bike training and periodzation in those programs.