Have your Hussey Power-Trac III and IV Drive Wheels melted? If this has happened on your Hussey Bleachers, then you may want to think about replacing them with our Hussey Drive Wheel, Part # P2003HS, which are rubber. For some reason, and no one has given us a good answer, the poly urethane wheels just melt after 15 to 25 years, even in cold climates like Minnesota! The reason may be the floor wax or some chemical reaction, but stay away from them. Replace them with our Rubber Tread version of the Power Track Drive Wheels. The wheel measures 4″ in diameter, 6″ wide with a 7/8″ axle. If you have questions on this wheel or any other bleacher wheel please call or email our Bleacher Experts!