Everyone and their brother has tried to make drivetrains faster with larger derailleur pulleys & ceramic bearings, but absoluteBLACK’s new HOLLOWcage may be a truly revolutionary bike upgrade. The name pretty much sums it up, your conventional cage & pulleys get replaced by a lightweight hollow carbon cage with a giant low friction carbon pulley … Continue reading absoluteBLACK HOLLOWcage reimagines wild, low friction rear derailleur pulleys