Geeze, I don't know... there really isn't any 'established' tire pressure per se. Consider the variables... loaded weight of bike, weight of rider and/or pillion, weather (hot/cold), driving conditions (wet, dry, straight, curvy), riding style (aggressive, non-aggressive), city/highway, blah, blah, blah and on and on and on. Over-inflation will wear the centre out prematurely, yet pressurizing slightly higher than manufacturer's recommendations may prevent cupping (
see article on the subject of cupping.
Experience will tell you the optimum pressure for your bike. But I find if I generally go by the manufacturer's recommendations, I'm at least in the ball park. Add some air for weight... take a little out for hot weather/pavement and so on. In time we all develop a 'feel' for optimum tire pressure... or we just dial in something close and ride, baby ride!!!!!!
