There is a lot of talk on the forums about running lower pressures. I went looking for the chart and couldn't find it. The theory that if you put too much pressure in your tires, the ride will be harsh; too little and you pinch flat; just right and you get perfect rolling resistance and comfort. Or so the theory goes.

This is also part of threads of running 23 vs. 25. The theory being, given the same tire composition and same pressure, the 25 will offer less rolling resistance than the 23.

Do I believe any of it? I've dropped the tire pressure on my bike from 115 to 105 and have not pinch flatted and it is a more comfortable ride. I'm not noticing a slowdown, but, then, I'm not exactly a speed demon either.