Join Date: Feb 2007
Location: San Francisco, CA
Bikes: 2006 Lemond Etape 105/Tiagra
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Looks fun, I'm not too familiar with the area, but if it becomes an event I'd definitely do it. 2900 feet over 45 miles (much less 100) isn't very much - it would probably challenge beginners who have little climbing experience.
Essentially it looks like an extended 1800 ft "climb" to mile ~40 with some rollers breaking it up a bit. I say "climb" because although it does go up to ~2200 ft from ~600ft it's over such a long distance that the grade would hardly be percieved as hilly until you get mile 33 or so (not counting some of the rollers). That's when starts to look steep, but even ~1400 ft over ~7 miles is just about an average %4 grade.
So while the elevation profile makes it look like you've got an impassable mountian the middle of the route, the amount of climbing is very reasonable, dare I say not enough to make it challenging for those more accustomed to spending a lot of their time in the hills. Some of my regular rides
include twice as much climbing in 2/3 the distance.
Of course that doesn't mean it still wouldn't be a blast, count me in.