Diamondback Bicycles is a major bicycle brand that is based in Kent, Washington. Diamondbacks are sold in many countries, including the United States, Australia, Canada, and the United Kingdom. Most Diamondbacks are considered to be mid-type bicycles,[1] with a high-end prototype in development as of 2011.[2] Diamondback is owned by global private equity firm Regent, L.P., which also owns the Mavic cycling brand and Redline Bicycles.

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. Early in its history, the brand name was “Diamond Back” and in 1994 this changed to “DiamondBack” and then to “Diamondback.” Beginning in 1990, Western States Imports started selling its mountain bikes and road bicycles under the Diamondback name as well. Since 1979, many riders have successfully competed under the sponsorship of Diamondback, which began with BMX and expanded to Mountain Bikes with the creation of Diamondback Racing (DBR) in 1993.

In 1999, Diamondback Bicycles was purchased by the Derby Cycle Corporation, which also owned the Raleigh Bicycle Company, and merged Raleigh and Diamondback together. In 2001, Derby Cycle Corporation sold Raleigh and Diamondback. In August 2019 Accell Group sold Diamondback to Regent, L.P.

Diamondback is a partner with several advocacy groups, including the Evergreen Mountain Bike Alliance, the Cascade Bicycle Club, Bikes Belong, and the International Mountain Bike Association.