120V/1PH/2.0HP motor, more strong power and high efficient working. Rim clamping outside 12"-22" and inside 14"-24". Top level motor and pure copper winding, fast heat dissipation, low defect rate and longer using life. The mounting head is made by stainless, solution treatment and interface polishing, the shape conforms to the engineering principle,and take with plastic cover for protect rim. With high quality filter, reliable drop oil, effective filter water, pull type pedal control system, convenience for changing and