*Fully compatible with SRAM Red D1/E1 and SRAM Force D1 groupsets. The CeramicSpeed OSPW Aero ALPHA system for SRAM Red/Force AXS derailleurs upgrades the fastest and most proven aerodynamic derailleur cage, including our patent-pending ADR bearing protection and the silent ALPHA disc with composite tooth-profile pulleys. Additionally, a speed-defying stripe graphic has been added for a touch of visual movement. The OSPW Aero ALPHA cages have been updated to accommodate the ADR-equipped ALPHA disc pulleys. It is not possible to add these pulleys to a previous generation OSPW Aero cage. In the box: Complete OSPW Aero ALPHA for SRAM Red/Force AXS system. eTap AXS tool.