Now I'm wondering what it could possibly mean when the tire says "115-125 max". Does that mean that the max pressure you should use could be 115 or 125? So maybe it's within specs if a tire blows out with 124 psi? Crazy way to label a tire. Don't feel like you need to inflate a tire to it's max. It may roll better and handle better for you at a lower pressure, plus it will probably last longer. If you're getting pinch flats, the pressure is too low (or the potholes too deep). If you're getting blowouts or frequent punctures, the pressure is too high. Another tip (which you probably don't need) is to always make sure that the valve stem is straight and fully inserted into the rim. Regarding installing tires without tools, it takes strong fingers to start the job, and sore thumbs to finish.