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SRAM X.9 10 Speed Rear Derailleur 2012
The new SRAM X9 10-speed rear derailleur brings you legendary SRAM X0 performance and reliability for less (and with only a slight weight penalty). It features Exact Actuation ratio technology for lightning-quick shift response and Di.R.T (Direct Route Technology) for top performance with minimal shifting effort. You can spend more if you want to, but if crisp, efficient gear changes are what you're after, X9 will suit you just fine.