IMPORTANT! NO TIRE ON A SECTIONAL WHEEL, REGARDLESS OF DESIGN, THAT IS NOTICEABLY LOW OR FLAT SHOULD EVER HAVE AIR ADDED TO TRY TO REINFLATE IT!
There is just too much of a possibility of parts coming loose and allowing sections of the wheel to go flying. Sometime when you've got a little time to play with a calculator, figure the number of square inches in a tire's sidewall, then multiply that by the pounds per square inch of pressure in the tire. Even 20 pounds of pressure on a big tire equals several TONS of pressure pushing against the bead ring.
Jerry