I run radial slicks on these steel rims and have no leaks at all. I used to have screws in my steelies on the rear and I just put my radial slicks on the steelies with the holes and I have no leaks at all. My car can sit a few months in the winter and still have the same air pressure in them when I get it back out in the spring. I use no screws or tubes with the radial slicks and they work great. Ron