Pulley wheel: 12T upper, 19T lowerCNC AL7075 with PVD coatingBearing: TBTHardware: Anodized AL7075 bolt, hardened steel axleRD Compatibility: SMN R9100, R9150(Di2), R8000, R8050(Di2)Drivetrain capacity: 16T (chainring) + 23T (cassette)Lowest (largest) cog: 34TColour: Black/Gold