this is crazy...i have a 12volt air compressor,and i have 30psi in my stock tires now,and for some reason i cant get more in them...like i said im using a portable compressor,im going to stop by the gas station and try there compressor...i checked the gauge and added air to my wifes car with no problem...i noticed the valves on the charger seems to have different insides then the normal valves....does anyone know that maybe the portable compressor does have enough pressure to fill these tires...