Ordinary sheet metal screws create two problems. One, with a wide thread pitch screw running in and out of a soft, thin cross section, damage to the wheel is guaranteed. Two, a substantial amount of force is required for the course threads to "get a bite" into the steel cords within the tire bead. With a dull or blunt point, the result is usually the tire getting pushed away from the rim instead of the screw penetrating into the tire bead. Not to mention, sheet metal screws are quite unsightly on a set of nice aluminum wheels. There is another solution and it has been specifically designed for this application. It involves using a stainless steel threaded insert that presses into the rim along with a 12-28, button head, alloy screw with a fully threaded point that provides improved tire bead penetration. You can see what I'm talking about at
www.kaizen-ms.com/products.html. Also, on the tech info page you will find details on insert and screw selection criteria (there are three different O.D.'s to choose from on the inserts and two different screw lengths). The installation instructions can also be found there. Take care.
Chris Cogan
www.kaizen-ms.com