Abstract: This invention is a safety wheel for 18-wheel trucks and is bolted to their steer/drive wheels using the existing studs and nuts. It is made from a ?? steel disc and a smaller secondary ?? steel disc with the same external diameter, the periphery being supported by a ?? steel ring and by ?? steel triangular braces The extreme outside of the device is covered by a hard rubber “tire”. The diameter of the safety wheel is 4? less than the diameter of the truck tire, and in the event of a blowout, the safety wheel only allows the truck wheel to drop 2? instead of going flat, thereby facilitating the driver to maintain the control necessary and helping to prevent the truck from rolling over or swerving into the on-coming traffic.