The tires used on vehicles that are typically driven on city streets are very different from the tires that are used on racing cars such as stock cars (NASCAR type). A typical passenger vehicle that is street-legal uses a tire that has deep treads and is 9 inches wide on average.
Tires that are used on racing cars are wider, generally 11.5 inches wide and made from flat, slick rubber .
with no tread for maximum speed on the racetrack. A more detailed explanation, including illustrations, can be found on the ESPN website, located here: http://sports.espn.go.com/rpm/news/story?series=2&page=nascar101/tires.
There are several makers of race car tires. One of the most well-known is American Racer Tire. Its official website is located here: http://www.americanraceronline.com/. This site offers tires for dirt track racing, ATV racing, asphalt racing and many more.
More Reference Links: http://sports.espn.go.com/rpm/news/story?series=2&page=nascar101/tires http://www.americanraceronline.com/