CeramicSpeed OSPW Alloy SRAM Pulley Wheel Red/Force AXS - Alternative BlackSpecifications Pulley Wheels: CeramicSpeed 15 tooth upper and 19 tooth lower Pulley Wheel Material: Aluminium Cage Material: Carbon reinforced PA Bearing Options: CeramicSpeed Standard or Coated CeramicSpeed Grease Oil: CeramicSpeed Oil for Pulley Wheel Bearings, 15 ml. dropper bottle Compatibility: SRAM Red AXS and SRAM Force AXS. 2020 SRAM Red eTap 11 speed derailleur with the orbit clutch. This system is also compatible with the wider range Force