
Originally Posted by
ny biker
That depends on how many breaks you want to take along the way. They've taken the details down from the website now that they're finished with their 2009 events, but I think 8 hours was the limit for finishing, and 11:00 was the limit for reaching the turnoff which was between about 31 or 32 miles from the start. If you don't stop at all, you can average 12.5 mph and finish in 8 hours. If you allow a total of 1 hour for reststops, you'd have to average 14.3 mph.
Reststops are 10-15 miles apart. For the 70-miler in Philadelphia there were 5 reststops, located at 10 miles, 20 miles, 35 miles, 50 miles and 60 miles. For the full century I don't know all the details but I would guess they had 7 reststops, at 10, 20, 35, 50, 65, 80 and 90 miles. (I know they were definitely at 10, 20, 80 and 90 and am guessing at the others.)
So, you'd have to estimate how many of the reststops you would want to stop at and how many minutes at each. For example I always skip the first one because I don't need a break yet, but I find it helpful to stop at all the rest of them and I take my time stretching my legs while I'm stopped. Many people skip the last one because it's only 10 miles from the end. Subtract your total reststop time from 8 hours and you've got your max. ride time, and you can estimate a pace from there.
I generally average about 13.5 mph over the whole 70 miles, although I average 15-16 mph for the first 20 miles, because that section is less hilly. My ride time is usually about 5 hours and my total elapsed time including stops is about 6. I easily reach the mandatory turnoff before the cutoff at 11:00.