I wanted to start a thread about back pain, but not the kind of pain you get from b123's down lower than the top of your wheels. I ride a conversion with a 2" saddle to handlebar drop, 69 inch gear and i like to climb big hills. Of course I have to stand and pull on the bars. But this just kills my lower back! Has anyone else experienced fixed-gear-climbing-related pain? Do you know of anything I can do about it besides taking it easy for a while, then building up strength slowly?