SRAM X9 Rear Derailleur for 10-speed SRAM Exact Actuation for precise and dependable 10-speed performance Carbon and alloy cage makes it light andTough - 204 grams for medium cage 3 cage lengths available - Short for DH, Medium for 2X10 and Long for 3X10 Style points - 3 color choicesTo match your ride: Red, Grey, White Speeds: 10 speed onlyMaterial: Aluminum alloy links and forged B-knuckle, High Strength Grilon® P-knuckle, sealed cartridge bearing upper pulley, Aluminum long/med
Strengths: Strong, reliable, stiff, responsive, good quality materials
Weaknesses: none
Bottom Line:
When I first tried SRAM X9 a said f*** Shimano I'm sticking with this! This is so well made and it's really great derailleur! SRAM won me with this! :)