Tire recycling or rubber recycling is the process of recycling vehicles’ tires (or tyres) that are no longer suitable for use on vehicles due to wear or irreparable damage (such as punctures). These tires are among the largest and most problematic sources of waste, due to the large volume produced and their durability. It is estimated that 259 million tires are discarded annually (for years in the 1980s and 1990s). The same characteristics that make waste tires problematic, their cheap availability, bulk, and resilience, also make them attractive targets for recycling. Nonetheless more than half of used tires are simply burned for their fuel value. Approximately, one tire is discarded per person per year. Tires are also often recycled for use on basketball courts and new shoe products. However, material recovered from waste tires, known as “crumb,” is generally only a cheap “filler” material and is rarely used in high volumes.