pwr4all3- Watch that the bigger pads don't compromise the EFFECTIVENESS of the PC. Covering more area is one thing, but doing a good job is something else. *I* find that I seem to get slightly better results with 6.5" pads than I do with 7.5" ones. The PC is sorta easy to overwhelm anyhow (compared to, say, a Cyclo- notice how a PC will act differently when you bear down on it) and the larger pads seem to make it worse in this regard.