The SRAM X0 DH 10 Speed Rear Derailleur is designed to provide fast and precise shifts for the close ratio cassettes used on DH race bikes, 4X and jump bikes.SRAM X0 brings the right gear to your most heated trail battles-any terrain and every time.About SRAM SRAM Corporation was founded in Chicago, IL (USA) in 1987 by six employees with one component, Gripshift Twist Shifters. Today, SRAM"s commitment and growth can be measured by its 1,500 employees, its 150+ cycling products, and it"s 12 facilities worldwide. SRAM has found tremendous growth through innovative products, unparallel customer service, strong sales, and complimentary acquisitions. SRAM acquisitions include Sachs Bicycle Components, purchased in 1997, a leading manufacturer of chains, cassettes and hubs. In 2002 SRAM purchased RockShox, the world"s mountain bike suspension specialist. 2004 brought the purchase of both Avid brakes and Truvativ cranks and components. The addition of these companies has allowed SRAM to grow into the world"s second largest component supplier to the cycling industry. SRAM"s core philosophy is to make cycling better. Their commitment is expressed in their local, national and international team and event sponsorship.