The ultimate in cockpit data integration. Personalize your ride and your data with RED AXS controls and the Hammerhead Karoo. Use Bonus Buttons to scroll your head unit or shift your derailleur.* Aftermarket kit includes: Hammerhead Karoo, left and right Shift-Brake System controls, and flat mount calipers* Compatible with all generations of AXS derailleurs* SRAM Model ID: GS-RED-KIT-E1