The XX Rear Derailleur delivers incredible speed and precision. Sealed ceramic pulleys offers the highest levels of durability. The carbon fiber cage has a dedicated length specific to 2x10. Exact Actuation technology eliminates slop and shifting variation. Made of forged 6061-T6 aluminum B-Knuckle for stiffness and reinforced carbon composite coupled with advanced engineering makes it lighter stiffer and smoother. It’s a rear derailleur perfected for ultimate off-road performance. 181 grams.