Originally Posted by
cornucopia72
Wow! you are fast. For us to average 45MPH for an hour would require a grade of about -8% without thouching the brakes or coming out of the aero position, starting at 20,000' and ending at sea level. Wait, the highest paved road pass in the world is just shy of 16,000'.. we are out of luck.
Oh, I don't think we are that fast - probably just a lot heavier. We don't need anything close to 8% to reach 45mph. With the exception of Barton Flats and the flat running into the finish it was pretty easy for us. Stay in the tuck position and watch out for wind gusts at the corners.
http://www.cyclingpros.com/onyxprofile.htm
You should ride Breathless. I am sure you could do it, and finish well - very likely faster than us.