The Oversized Pulley Wheel System for SRAM Red and Force AXS features a 15-tooth upper and 19-tooth lower pulley wheel setting, for maximum efficiency. The handbuilt OSPW System has two spring tension settings, that allows customised setup based on riding conditions.This OSPW System is also compatible with the 2020 11 speed SRAM Red eTap derailleur featuring a clutch.In the box:Complete OSPW System for SRAM Red/Force AXS.,CeramicSpeed Pulley Oil, 15 ml. dropper bottle.,Custom tool for removal of stock cage and securing of OSPW System..Technical Data:Pulley Wheels: CeramicSpeed 15-tooth upper and 19-tooth lower,Pulley Wheel Material: Aluminium,Cage Marterial: Carbon reinforced PA,Bearing Options: CeramicSpeed Standard or Coated,CeramicSpeed Pulley Wheel Oil, 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 AXS medium cage derailleur.,Cassette Compatibility: Fits 12 speed 10 to 36-tooth cassettes. For use with the 11 speed clutched derailleur fits 11-32 cassettes.,Spring Tension Settings: 2 spring,Speed: 12 speed,Discipline: Road and Gravel/Cross.Special notes:Custom tool included for removal of stock cage and securing of OSPW. The factory clutch mechanism will remain intact and in stick form. There is no damage or modification to the clutch for the installation of the OSPW System.