For the first time SRAM offers the right combination of matching SRAM X7 components. SRAM X7 features 2X10 drivetrain, X-Glide front shifting, Exact Actuation, new PowerGlide cassette ratios, carbon cage rear derailleurs, new S1400 crank offering and Avid Elixir R brakes. SRAM 2X10 is becoming understood by riders of all levels and segments by delivering a full range of usable gears, less weight and faster and smoother shifting. We build on this with choice, and a strong materials mix aimed at mid-level XC to entry level downhillers and freeriders.
http://www.sicklines.com/2010/03/17/2011-sram-x7-2×10-10-speed-group-launch/