Harvey Firestone the founder of Firestone tires was born this day in 1868. He was a pioneer in pneumatic air-filled tires. More recent events had his heirs wishing he had dabbled in solid rubber instead. Today, ?flat-free? tires are flying off dealers shelves. They're for bicycles, lawn and garden tools and have a wide range of industrial uses. Today's ?flat-free? tires come in many forms -- from solid rubber to those filled with lightweight closed-cell foam. All are maintenance-free and puncture-proof. Newer models use high-tech blends of polyurethane that is even lighter and tougher. And they have an air-cushion feel that rivals a conventional inner tube ride. They're oil- and chemical-resistant, with non-scuff treads that don't leave marks. And they come in lots jazzy colors from yellow and green to red and blue -- as well as traditional black. And, the best part: They last twice as long as regular pneumatic air-filled rubber tires.