I have a wheel on my 14 dart. It is the factory 18in wheel. It slowly loses air. Very slowly like 10lbs of air loss in a 12 days. The tires are new . Back story is it did this same thing with the previous set of tires on this wheel. The bead area looks clean as well. What can I do? I'd rather not take it to a shop to dismount the tire since very few places around me can correctly balance them. Anything I can do ? Thanks everyone.