I spent last Saturday shopping for a new bike. The hybrid I have been riding is too small, and won't work for the longer rides I want to do this year. I started out looking at the comfort road and touring bikes, thinking that was the geometry I was interested in. But I've decided I like the feel and handling of the traditional road bike better. I haven't found any women's specific bikes with frames big enough to accomodate my long legs (at least not yet; still shopping). Because of the problems with my current bike, I am super sensitive to the fit issue with a new bike. So I have been test riding nice, big bikes. By the end of the day on Saturday, not only was my butt sore from all those narrow, hard little road bike saddles, but my knees were sore. Lots of what I rode didn't fit, but I'm wondering if I was looking at bikes that are too big? Would too much extension cause sore knees? I wasn't on anything where my leg was completely straight at the bottom of the crank. Or maybe the sore knees were just from riding so many different bikes all day. Does anyone know what would cause the sore knees?