Is it really necessary to follow the manufacturers recommended pressure rating for a mini pump, or is that just a generic guideline that can be ignored in favor of personal preference? Ive seen some pros riding with pressures significantly higher or lower than recommended, and they seem to be doing just fine. Whats the real-world impact of running a few PSI above or below the recommended rating? Are we just being paranoid about pressure, or is there a legitimate safety concern here? And what about the role of tire type, road surface, and riding style in determining the ideal pressure - shouldnt these factors take precedence over some arbitrary number on the side of the pump?