Roads here suck, and I have to take it off-road occasionally at work. That's not mentioning the car-obstacle course of getting on base, and avoiding all the pot-holes, surface changes, and stupidly high driveway ramps.
The lowest my car can go on 195/50's is one inch. I don't want to tempt the gods by lowering more than that. Right now I've got 195/55r15 on, but still, I don't want to tempt the gods of shitty roads.