My tires are rated 35-80 (Specialized dual-material supposedly wsd tires) and I ride them at ~30ish on really technical stuff, because I'm only around 120 with all my gear on. I've never pinchflatted, but then again, I'm a sissy and don't do big drops and probably won't until I know I have available funds for an emergency room visit or to true wheels (one of those is more important, but I'm sure my priorities lie with the bike...)