Absolute Black Derailleur Pulleys | Hollowcage Carbon-Ceramic OSPW, for SRAM ETAP AXS

The New Era of Silent Pulleys. Meet the Silent "XRING Pulley™"
Does it bother you when you ride in tranquil scenery, but you can still hear your bike's drivetrain? This familiar clunking noise has been accompanying us on every ride for decades. It's time for a change.

Standard polymer pulleys are fairly loud, which has always been the norm. Aluminum pulleys are even worse as the material radiates the sound more than any polymer, making them louder. We are introducing a new generation of pulleys, which can reduce the sound level by 12-14dB compared to stock pulleys. This corresponds to roughly 60% of the noise reduction. Practically speaking, the cage becomes very silent. We use a pending patent solution, our unique xring rubber suspended bands, that dampen the chain impact on the guide pulley teeth, eliminating the engagement noise, the single most significant contributor to overall drivetrain noise. From now on, your ride will be more silent than it used to be, and you will hear sounds you haven't noticed before. It's the new era of derailleur cages.

HOLLOWcage® for eTap AXS Red & Force 12spd derailleurs finally makes your AXS drivetrain whisper quiet. Our revolutionary mono-plate OSPW is the most tranquil and best-shifting oversized derailleur cage for eTap AXS created to date. HOLLOWcage ® OSPW has a carbon-polymer mono-plate construction with bespoke, large, full ceramic bearings and the most advanced silencing pulleys ever made.

SRAM ETAP AXS is known to be louder than other drivetrains. Our HOLLOWcage® with Silent "Xring Pulley™" eliminates this problem allowing you to enjoy the ride.

Why is Our OSPW Hollowcage® so Special?

• It is Incredibly silent (over 12dB noise reduction vs. stock).
• The shifting is as good as with the original cage.
• One of the lightest oversized cages on the market.
• First mono plate construction of its kind.

Our bearings are full ceramic. In technical terminology, it is a bearing with inner and outer race and balls made of ceramic material. The seals and the cage, however, are made of polymer. Other common types of bearings are steel bearings and hybrid bearings. The latter is often mistakenly called a "ceramic" bearing, but only the balls are ceramic. Races are still made of steel. Hence there is a term "full ceramic," indicating that not only the balls are made of ceramic but both races too. Our bearing races are made of 100% Zirconia Oxide ceramic, and balls are made of Silicon Nitride ceramic. The cage and seals are, of course, made of low-friction polymer.

How to Mount Hollowcage for SRAM ETAP AXS Cage

Find the Correct Chain Length for Hollowcage SRAM AXS
Wrap the chain around the biggest sprocket of the cassette and the biggest front chainring, omitting the derailleur cage completely. Holding the chain under tension, pull the ends together, so they touch. This is the base length.

Depending on the drivetrain, you need to add the following to the base length:

• Extra two links for 10-28T & 10-33T cassette in 2X scenario.
• Extra two links for 10-36T cassette in 2X system.
• Extra four links for 10-33 or 10-36T cassette in 1X system.
• Extra four links in 2X plan only if you upgrade from 10-33 to 10-36T cassette (i.e., when your bike came with 10-33T but you upgrade to 10-36T).

Specifications

• Size: (Mass +/-1g): 69g
• Color: Lower lockring: PVD Rainbow, Black, Titanium, Red, Gold; Upper lockring: Black
• Compatibility: Sram eTap AXS Red & Force & Rival 12spd derailleurs. Works with 10-28T & 10-33T & 10-36T cassettes (check chain length calculation at the bottom). Not compatible with Sram XPLR and 11spd Red / Force. Works ONLY with AXS Flat Top chain. Do NOT mount any other chain.
• Materials used: Carbon fiber-polymer matrix, 7075 Aluminium, rubber, ceramics
• In the box: Complete cage, lockring tool, special tool, 2x spare xring rubbers

SKU# TCRCAGEAXS/BK-GL_Std