Being in shape to ride a century, and being in shape to ride a specific bike for 7 to 10 hours are different things!

If the bike fit is of even just a little off, it could fatigue your muscles in a way that's unfamiliar to you, and become a big problem late in a long ride.

Time spent on a new bike -- and the resulting fit adjustments -- is just as important as your physical conditioning.

It seems like your time frame is going to be pretty tight, with the cold weather and desire for a new bike and need for riding time.