HOLLOWcage for Shimano 9100 / 8000. Our revolutionary mono-plate design is the quietest, best shifting, aerodynamic derailleur cage design created to date. It is a dawn of new era for rear derailleurs. HOLLOWcage has a carbon-polymer mono-plate construction with bespoke, oversized, full ceramic bearings and the most advanced silencing pulleys ever created.

Specifications

• It is super silent (over 12dB noise reduction vs stock)
• The shifting is as good as with the original Dura Ace cage
• Its more aero than the OEM cage and other oversized cages
• It saves more watts than other cages
• One of the lightest oversized cages on the market
• First mono plate construction of its kind
• Weight: 71G
• Colour: Lower lockring Black, Titanium, Red, Gold & PVD Rainbow

• Compatibility: Shimano Dura Ace 9100 / 9150 , Ultegra 8000 / 8050. Fits up to 32T cassette.
• Matrials used: Carbon fiber-polymer matrix, 7075 Aluminium, rubber, ceramics
• In the box: Complete cage, lockring tool, 2x spare xring rubbers.