Rotor include 6 bolt and Center lock rotors are interchangable with all shimano disc brakes as long as the hubs and rotor size match the caliper. The innovative design sheds weight, dissipate heat and dramatically improves overall performance. Freeza Technology (RT-99) features 3-layer structure with aluminum core and stainless steel outer layers and addtional aluminum cooling fins, reduces rotor surface temperature approximately 150 degrees Celsius compared to all-steel rotors. RT-80 rotors are Centerlock OS, compatible with For Saint M800 & M805 hubs only.