absoluteBLACK HOLLOWcage Oversized Derailleur Pulley Cage - For Shimano Dura-Ace 9250 , Full Ceramic Bearings, Carbon Cage, Titanium

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The absoluteBLACK's HOLLOWcage® for Shimano Dura-Ace 9250 12-speed derailleurs makes the 9250 drivetrain whisper quiet. It features a carbon-polymer mono-plate construction with bespoke, oversized, full ceramic bearings and one of the most advanced silencing pulleys ever made.
Designed for use with Shimano Dura-Ace 9250 drivetrains
Fits up to a 34t cassette
The Silent Xring Pulley dampens the chain impact on the guide pulley teeth, eliminating the engagement noise
Incredibly silent (over 5-7dB noise reduction vs stock)
HOLLOWcage uses full ceramic bearings (Silicon Nitride ceramic balls and Zirconia Oxide ceramic races) that make the guide pulleys incredibly stiff for greater shifting precision
One of the lightest oversized cages on the market (71g)