My geared commuter is 42# with its handlebar bag, ~37# w/o (that includes a bunch of other crap that I never take off like the pump, tool bag, coffee cup...)

Looking at a charity century I am thinking this might not be the bike for that ride. I don't know, I've never done a ride that long. It's the 7k feet of climbing that make me wonder about the extra weight. I only have ~800' of climbing on a commute day.