The Challenge is tentative for me, as well. Depends on about three different things: 1) if I'm crazy enough to enter the Santa Cruz crit the next day; 2) the weather (remembering '06 clearly); and 3) what condition my back is in (I hurt it a year ago...still recovering).
Either way, sounds like a nice ride, so I signed up for the 100....I can always switch to the metric on the day of.
Bleary-eyed remembering how early your "early" is...
It would be nice to ride with someone, though.
~BikeMomma
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." --Albert Einstein