Axiom is now introducing the fastest of the new 19 turn equivalent brushless motors for the ROAR and IFMAR brushless spec classes. The DUO motors feature adjustable timing, sintered rotor, heavy duty precision ball bearings, and a light weight aluminum can. The best part is the DUO motors may be used with either sensor or sensorless speed controls. This allows the racer to run what is the best speed controller. You are no longer locked into one type or manufacturer of speed controls. Meets all ROAR, and EFRA rules.