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HOLLOWcage® for Shimano 9100 / 8000. Our revolutionary single plate OSPW design is the quietest, best shifting, aerodynamic derailleur cage design created to date. It's the dawn of a new era for rear derailleurs. HOLLOWcage ® OSPW has a carbon polymer single plate construction with custom oversized ceramic bearings and the most advanced silencer pulleys ever created.
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