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Last time I did the math, at 50 mph the difference between 0 power and that Armstrong guy at peak power was about a 2 mph difference. That's assuming you're using a hill to get to 50 mph, so if you aren't, adding that difference (around 500 watts, as I recall) would get you the 2 mph--though that would mean you're putting out way more power than Armstrong, which isn't something I would require to be considered a "good rider".
Of course, the design of the bike makes a difference--they've gotten pedal-powered vehicles to over 200 mph--but I don't think 65 mph is normally acheivable without either a draft or a hill. According to my calculations, the fast road bikes where your body is horizontal (minimizing wind resistance) can get to just under 70 mph on an 18% grade, or just over 70 mph if you add in the 500 watts, but 18% is *steep*.
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