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