Originally Posted by
wild animals
I'd get myself down to 3mph by not-quite-fully engaging the brakes, and when I'd let go again, I'd be going 30 in like 5 seconds (please don't do the math on this), without pedaling.
Spoil sport.
Oh what the heck. 30 MPH in 5 seconds is an accelleration of 8.8 ft/sec, which is about one quarter gravity. It's probably not a simple as that implying a 25% grade, but might not be far off.
From that terrain map it looks like the steep section drops 320 feet in altitude in about 2500 feet of road. That computes as a 12.8% grade if I read the map correctly. While that's not insane it's pretty steep. My claim to fame is once climbing 400 feet in a mile even. That 7.6% average grade was plenty enough to give me a bad case of the willies going back down. But I have a problem with heights and the descent set off my acrophobia.