Diamondback Bicycles was founded as a BMX brand in 1977 by Western States Imports in Newbury Park, California, which sold bikes under the Centurion (bicycle) brand. It is now based in Washington US. Diamondbacks are sold in many countries, including the United States, Australia, Bangladesh and the United Kingdom. Most Diamondbacks are considered to be mid-type bicycles. An affordable family brand of bicyle available at major retailer Big W.