Brake Disk Rotor | Hard Enduro | Surron Ultra BeeDirtyBike High Performance Hard Enduro 240mm Brake Disk Rotor For Surron Ultra Bee This DirtyBike designed, super strong brake rotor was developed from our experience racing hard enduros like RedBull TKO, where we tended to bend a rotor almost every ride. 18 legs transmits torque to the solid inner hub considerably reducing the possibility of bending. The round outside reduces the tendency to collect mud and bring it into the caliper where it can