Source: SRAM

Here are some details from SRAM on its new X0 downhill crank and derailleur:

Truvativ X0 10-Speed DH Crank
• The world's first Carbon DH crank weighs just 750g, including Bottom Bracket (GXP83, 165mm, 36 ring)
• Lightest single ring available is made of 7075 CNC alloy, 34, 36, or 38 teeth
• Available in 170 and 165mm arm lengths
• All new DH30 spindle for 83mm Press Fit 30 shells
• Available in GXP, Press Fit GXP, 73 and 83mm spindles
• Lightest-in-class composite construction with forged aluminum spider and high strength 7075 T6 alloy pedal lug
*Two graphic colors: New Silver and Red

SRAM X0 10-Speed DH Rear Derailleur
• SRAM Exact Actuation for precise and dependable 10-speed performance
• Designed to work with any cassette up to 28-tooth large cog
• Exceptional shifting performance
• Lightweight, durable, and reliable
• Compatible with any 10-speed Exact Actuation shifter
• Two graphic colors: New Silver and Red