I'm weary of repeating myself, but do so nonetheless, since I can't know if you have read my former comments about this, or not.
So, long story short: growing up more or less disinterested in TV, because small B&W only at home, having more fun playing with my classmates in the forest and so on, I've been mostly unimpressed with TDF and similar. Even on larger color-tv when at home of some of classmates. You know why? Because I couldn't afford expensive bicycles, had no cars following me with spares, which in turn required maximum attention of my driving, and lastly I did not dope ;-> Oh, and running marathons instead if temporary lack of funds required waiting until I could repair my bicycle, because there was always something to fix/exchange, at least the way I've driven. Which came up to 300km a day, not every day, but often. Which in turn I didn't even notice, because I just didn't care about trip distance, instead being fixated on pushing the needle of the tachometer to the right as often and as long as possible :-) My neighbour noticed instead, and couldn't believe it. This went on for years, at least during school times, then went down a little because of real life constraints like work, time, etc.
So TDF and the likes just made me think: So what?
But still 100km is nothing special at all, and 50km are nothing. 160km I do notice, but hey, 3-speed from 1985, who cares? :-) Oh, and I drive during all weather, even on ice, but that is rare.
I am neither some hulk, nor some doped bicyling celebrity. Just fit, born in 1969, 181cm tall, and usually weighing somewhere between 81 to 85kg(83 atm).
Oh, and this 3-speed bicycle from about 1985 I'm speaking of I bought used for 150€ in 2005, which the shop keeper has shown me, after I've been unsatisfied with the 100eds of trash bikes on display, asking for something 'usable' and 'normal' instead. They just aren't built like that anymore!
(Frame of Randonneur, 27"x1 1/4 wheels, classic handlebar, Sachs Torpedo 3-speed hub with coaster/back pedal brake, feeble front wheel brake, mudcatchers, siderolling front dynamo, lights, porter/carrier with wirebasket fixed to it with cable ties, heavy saddle with steel springs, 12.5kg!
Has been sold as "Deutschlandrad" by Kalkhoff at the time)
edit: Ring, Ring!