AbsoluteBlack Hollowcage V2 Carbon Ceramic Oversized Derailleur Pulley Cage - Shimano Ultegra R8150
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AbsoluteBlack Hollowcage V2 Carbon Ceramic Oversized Derailleur Pul...
AbsoluteBlack Hollowcage V2 Carbon Ceramic Oversized Derailleur Pulley Cage - Shimano Ultegra R8150 Info
The AbsoluteBlack Hollowcage V2 Carbon Ceramic Oversized Derailleur Pulley Cage - Shimano Ultegra R8150 replaces the stock Ultegra derailleur cage with an oversized pulley setup built around 12-tooth and 18-tooth pulleys instead of Shimano's standard sizing. The larger pulleys reduce how sharply the chain has to wrap around each wheel, which is the underlying reason oversized pulley cages tend to run smoother and quieter than stock hardware.
AbsoluteBlack builds the cage itself from a mono-plate carbon-polymer matrix — the same material composition SRAM uses for its RED eTap AXS derailleur cage — reinforced with 7075 aluminum where the pulleys mount. The complete unit weighs 67 grams and is rated for cassettes up to 34 teeth, so it stays compatible with a wide range of Ultegra R8150 setups rather than forcing a narrower gearing choice. Inside, the pulleys run on full ceramic bearings, with zirconia oxide races and silicon nitride balls that AbsoluteBlack has had independently tested via X-ray diffraction through Lucideon Ltd, a UKAS-accredited lab.
The standout feature here is AbsoluteBlack's patented Xring Pulley design, which uses rubber-suspended bands around the pulley teeth to absorb the chain's impact as it engages. AbsoluteBlack states this cuts noise by 5 to 7 decibels compared to a stock Dura-Ace pulley setup — a manufacturer figure worth treating as their own claim rather than an independently verified test, but the underlying mechanism is straightforward: less metal-on-metal contact means less noise. AbsoluteBlack backs the bearings with a 4-year warranty and the rest of the cage with a 12-month warranty, and it's available in five finishes — Black, Titanium, Gold, Red, and a PVD Rainbow option — so it can match the rest of an Ultegra build's aesthetic as well as its function.
This is a cage for Ultegra R8150 riders who want a quieter, smoother-running drivetrain without moving up to Dura-Ace, and for anyone who's decided full ceramic bearings and a lighter cage are worth the upgrade over stock hardware that already works fine.
