CeramicSpeed OSPW X Pulley Wheel System for Shimano XT/XTR 1x12 - Alloy Pulley Carbon Cage Black. The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design.

Features a 14-tooth upper and 18-tooth lower aluminum pulley wheels with Grade 3 Silicon Nitride balls to provide absolute optimization of the rear derailleur

Robust cage crafted from polyamide and carbon fiber for durability and light weight

Compact cage design allows the use of the same length chain as stock pulleys

Two spring tension settings allow customized setup based on ride conditions

Only compatible with 1X specific derailleurs - XTR M9100-SGS/GS and Shimano XT M8100-SGS