11speed 25T/11speed 28T/11speed 32T/11speed 34T Freewheel. Mountain Bike Freewheel. Compatibility For: Shimano DURA-ACE Di2(R9150) DURA-ACE(R9100) Ultegra Di2(R8050) Ultegra(R8000) 105(R7000),SRAM RED22 SRAM Force22 SRAM Force SRAM Rival, it won't work with Campagnolo.