HOLLOWcage® for Shimano 9100 / 8000. Our revolutionary mono-plate oversized pulley wheel (in short OSPW) design is the quietest, best shifting, aerodynamic derailleur cage design created to date. It is a dawn of new era for rear derailleurs. HOLLOWcage ® OSPW 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 (+/-1g) : 71G
Colour: Lower lockring: PVD Rainbow, Black, Titanium, Red, Gold ; Upper lockring: Black.
Compatibility: Shimano Dura Ace 9100 / 9150 / 9170, , Ultegra 8000 / 8050. Fits up to 32T cassette.  Not compatible with Ultegra long GS cage derailleurs
Matrials used: Carbon fiber-polymer matrix, 7075 Aluminium, rubber, ceramics
In the box: Complete cage, lockring tool.

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. For Sub Compact (<34/50t) and Compact (34/50t) chainring combinations, you can use the lowest spring tension setting (First hole from left). However, If you ride on roads with potholes, cobbles, etc. it is recommended to set the HOLLOWcage to the high spring tension (First hole from right). If you have 52t chainring or bigger, use high spring tension setting.

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