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.

WHY IS OUR HOLLOWCAGE® SO SPECIAL?
It is super silent (over 12dB noise reduction vs stock)
The shifting is as good as with the original Dura Ace cage
It’s 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.

Check out our blog for the full product overview, you can find it here

HOW TO MOUNT HOLLOWCAGE
Please refer to the video instruction below.  You should mount the cage with the lowest spring tension setting (First hole from left). If you use 11-32T cassette in combination with 52/36T chainrings or bigger you may need to set the cage with middle spring tension setting (middle hole) to account for the chain growth, but only if first position produces loose chain in small - small gear.

Getting your chain length right video guide please click here

Designed in England. Manufactured in EU. The World's best oversized derailleur pulley cage

HOLLOWcage® is a registered mark of absoluteBLACK. "Xring pulley™ " is a trademark of absoluteBLACK. Mono plate cage construction, as well as silencing pulley is protected by several patent applications. #HOLLOWcage, #ospw, #oversizedpulley