Hollowcage® V2 Shimano 9100/8000 Carbon Ceramic Oversized derailleur pulley cage


$419.00
Color : PVD Rainbow
Variant : 12/18T
Availability

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HOLLOWcage® V2 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.


What’s new with V2


We devoted countless hours to sourcing advanced materials, all while refining the very essence of the mono-plate construction. The new mono-plate also boasts a glossy finish that highlights the carbon fiber construction. It is now made from the very same material as used by SRAM in the RED eTap AXS derailleur cage. Our ceramic bearings have been rigorously tested and independently certified using X-ray diffraction by Lucideon Ltd, a UKAS-accredited authority in ceramics and material science.


Impressively silent

" After month of riding I am very impressed with how silent my drivetrain is, AB totally nailed this one ."

Fast and crisp shifting

" Shift precision in second to none , which was the biggest issue with the previous oversize cage I had."

Hands down, best looking cage

"I simply got it for the bling factor (pvd version) and it didn't disappoint. It became a conversation starter on every bike ride."

Sexy as hell!

" My bike finally looks sexy "

Size (Mass +/-1g):

67g

Color

Lower lockring: PVD Rainbow, Black, Titanium, Red, Gold

Compatibility:

Shimano Dura Ace 9100 / 9150 / 9170 , Ultegra 8000 / 8050. Fits up to 32T cassette. NOT compatible with Ultegra long GS cage derailleurs..

Materials used:

Carbon fiber-polymer matrix, 7075 Aluminium, rubber, ceramics

In the box

Complete cage, lockring tool

Introducing the Silent Revolution: The Xring Pulley™ for a Quieter Ride

Do you find it disruptive when cycling through serene landscapes, only to be distracted by the sound of your bike’s chain engaging with the pulleys? That familiar clunking has been a constant companion for decades, but it’s time for a new era.


Traditional polymer pulleys have long been known for their noise, with aluminium options faring even worse, amplifying sound further. We are proud to introduce a groundbreaking new generation of pulleys, designed to reduce noise by an impressive 5-7dB compared to standard Dura-Ace pulleys—equivalent to a remarkable 40% reduction. In practical terms, this means a far quieter ride.

Our patented solution incorporates innovative X-ring rubber suspended bands, which absorb the chain's impact on the guide pulley teeth, effectively eliminating engagement noise—the primary source of drivetrain sound. From now on, your ride will be quieter than ever, allowing you to experience the subtle sounds of your surroundings like never before.


Full ceramic bearings

Our full ceramic bearings have been rigorously tested and independently certified using X-ray diffraction by Lucideon Ltd, a UKAS-accredited authority in ceramics and material science. Technically speaking, our bearings consist of both inner and outer races, as well as balls, all crafted from premium ceramic materials, with polymer seals and cages to ensure optimal performance. In contrast, other common types include steel and hybrid bearings. Hybrid bearings, often mislabeled as "ceramic," feature only ceramic balls, while the races remain steel. True full ceramic bearings, like ours, are entirely ceramic—both the balls and races. We use Zirconia Oxide ceramic for the races and Silicon Nitride ceramic for the balls, complemented by low-friction polymer cages and seals for enhanced durability and efficiency.



What is Injection moulding

The mono plate is made using advanced injection moulding technology which is widely used in the bicycle industry. It allows the manufacturing of very complicated shapes where carbon fibres are optimally aligned during the processing from the pellet to the finished component.


That same type of material and manufacturing process (injection moulding) is used by Sram to make their Red derailleur cage, by Shimano to make Dura-Ace derailleur cage, by CeramicSpeed to make their cages, it is also utilized in Shimano Dura-Ace break levers, mtb rocker links for suspension, tubeless valves, saddle shells and even by Magura to make master brake cylinders (Magura carbotecture). Not to mention that this technology has a very extensive use in automotive industry.


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.
For service / maintenance instructions please refer to our FAQ page.

In the video below you will also find how to determine the correct chain length for your HOLLOWcage. Following this tutorial is crucial for the proper functioning of the drivetrain.

We offer 4 year warranty on bearings* (for more information please refer to our FAQ page)




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 our special silencing pulley is protected by US and EU patents and pat. pend. applications US11661144, EP3915864, EP4234383A1, EP4234981A1, EP4183671A1, EP4119430A1, EP4119433A1, EP4119431A1. #HOLLOWcage, #ospw, #oversizedpulley


Share your Oval chainring photos with us on Instagram: #OvalThis #absoluteBLACK #OVALREVOLUTION