I've been toying with the idea of a Fixie for my commute. Problem is, I don't think I'm strong enough. It's 18km long, and both ends have hills, so that I hit the climb after riding 17km. The one into work is steep enough that I'm in 22 - 30 combo. Total weight for me, bike and gear is about 260 lbs. I figure I can drop that by 30 lbs, would I be able to do a flip/flop hub set up to give me enough gears to make the hill? How quick/easy is it to flip the wheel on the road? I think I might do it anyway because I can walk the hill in about 2-4 minutes.... hmmm.