Rohloff Speedhub 500/14 PM Disc 135mmQR 36h Black14 speed internal rear hub drivetrain system shifts under load Disc compatible: requires Rohloff specific 4 bolt rotor (sold separately) Reliable, low maintenance internal design for reduced wear Highly efficient with no gear overlap and maximum ratio range Shift indexing originates at the hub, instead of the shifter Hubs are to be laced 1x or 2x cross only. 3x can cause premature hub flange failure and therefore will not be covered under warranty