SRAM X9 Type 2 Rear Derailleur 2013
The SRAM X9 Type 2 adds the Roller Bearing Clutch to a normal X.9 derailleur to deliver maximum drivetrain stability, even through rough terrain. This clutch eliminates bounce and chain slap without sacrificing precision. Clutch is self-lubricating, maintenance free, uses needle bearings, and comes factory calibrated from SRAM.
This derailleur is great bang for buck. The clutch eliminates chain slap and keeps the entire drivetrain quiet. An X0 doesn't have much different than the X9 besides a few less grams and a carbon cage. Get the X9-Type2 and never look back.