SRAM BlackBox Ceramic Hybrid Bearing Pulleys XX1SRAM BLACKBOX CERAMIC HYBRID BEARING PULLEYS XX1 Upgrade your XX1 rear derailleur to ceramic bearing pulleys. FEATURES Reduce friction, increase stiffness, decrease weight, and add durability Grease is optimized for low friction and maximum longevity Comes with 10 ml syringe

quiet braking performance

durable and quiet performance

9mm x ID Ø27

Ritchey Bearings - 45° x 45°

Reduced rider fatigue

Bluetooth Low Energy and ANT+ compatible

RSC 2018 +

X-SYNC™ 2 chainring design increases chain retention

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Style Ultimate

The SRAM Force 1 Rear Derailleur adopts all the technologies of SRAM 1x MTB to provide the fastest

Cut-outs on the rear cog further reduce weight and add stiffness