Performance Bike
CeramicSpeed OSPW X Oversized Pulley Wheel System for Shimano XT M8100/XTR M9100 (Alloy Pulley) (Car
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From Performance Bike
CeramicSpeed Shimano OSPW System. Features: Proven to be the fastest pulley system, chosen by many of the world's leading cycling teams and professional triathlete Optimized tooth designs offer 3-5 times longer life than standard OE pulleys Coated: metallic layer that covers bearing races making them 75% harder than steel.