Leveraging the legendary history of SRAM shifting, the XX Rear Derailleur delivers incredible speed and precision. Sealed ceramic pulleys give you the highest levels of durability. The carbon fiber cage has a dedicated length specific to 2x10. Exact Actuation technology eliminates slop and shifting variation. It's a rear derailleur perfected for ultimate off-road performance. SPEEDS: 10 speed for 2x10 system. TECHNOLOGY: Exact Actuation ratio, Direct Route Technology. INNER/OUTER CAGE MATERIAL: Carbon fiber composite. SPRING MATERIAL: Titanium. INNER LINK: Forged magnesium. OUTER LINK: Forged AL-6061-T6. B-BOLT: AL-7075-T6. B-KNUCKLE: Forged AL-7075-T6. P- KNUCKLE: Grilon composite. BEARING PULLEYS: Sealed ceramic. HARDWARE: Titanium and AL-7075-T6; TORX T25 bolts. CAGE LENGTH: 93mm. COMPATIBILITY: 36 tooth.