Originally Posted by
Brian Ratliff
30mph, for a few minutes, plus the internet factor of overestimation, over various terrain (including downhills, quite likely), is quite within amateur capabilities.
Only time I've done 30+mph for more than a minute or two (solo) when I had a monster tailwind for about 6 miles. It was pretty awesome to almost spin out my 50x12 on flat land. On flat land with no wind you'd have to produce something like 400-500 watts to go 30mph (depending on your position) which is a pro level domestique effort to do that for any length of time.