The absoluteBLACK's HOLLOWcage® for Shimano 9100 and 8000 derailleurs makes the 9100 and 8000 drivetrains 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 9100 / 9150 / 9170 , and Ultegra 8000 / 8050 drivetrains
- Fits up to a 32t cassette
- The Silent Xring Pulley dampens the chain impact on the guide pulley teeth, eliminating the engagement noise
- Incredibly silent (over 12dB 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
- Upper pulley features tall teeth to provide improved shifting precision
- One of the lightest oversized cages on the market (71g)
- Not compatible with Ultegra Long GS cage derailleurs