When I run closed cell inserts I put 3 equally spaced 1/16 holes in the tire and 2 holes 1/8 in the wheel. When I run dual stage I only vent the wheel. If you have an air compressor, get a mounted tire (with no holes) with a closed cell foam and blow air into the wheel hole. It traps air between the foam and tire. Tire ballooning does the same thing.