I wanted a challenge and I got one. I rode my Trek XO1 Single Speed with a 39/16 gear on a 100k full of short steep climbs. 59 miles, 4,400 vert. feet, and 3h45' later, I was wolfing down a blueberry fry pie with ice cream.
I can't wait until tomorrow to see how my legs feel at the mx track. They'll probably fold like a cheap lawn chair under Rosie O"Donnel on the 1st jump.