The tires I've been riding are Bontrager H4 Eco 26x1.5 which have a rated pressure range of 45-65 psi. I'm a Clyde at 230 lbs and ride mostly on pavement. The bike is a homebuilt hybrid. I find that I get the least rolling resistance and most comfortable feel of the road with a tire pressure of around 70-75 psi. With the increased load, I think I must be getting about the same contact patch as a lighter rider would get at 60-65 psi. The tire wear looks normal with a nice, wide contact band down the middle. Outside of possibly accelerated tire wear, is there any other problem running a tire at 10-15% over the rated pressure?