Fredwina, I've put in 20 miles or so in one sitting so I am still breaking in the bike so to speak--and me. I am considering a century in October if I think I'm up to it.

So far the only thing I've changed is a 110mm to 100mm stem. I debated whether I needed to or not and I'll try the shorter one for now.

Cyclesome, I'm averaging about 14.5 mph with a cadence of 85. I feel pretty good after a ride and don't feel too spent. I just wondered if I would be able to go further on a lighter bike or if I just need to continue to train on this one. I guess what I'm wondering is.....do I need a different bike. Also, would a more aggressive position put more stress on the knees?