If the motor speed is 1440rpm, the motor wheel is 20 cm Item included: 1175PSI 5.5HP 811CFM V Type Twin Cylinder Air Compressor Pump Head Double Stage. ? WELCOME TO ryxfebruary – Your Trusted Destination! Driving power: 4KW (5.5HP). Cylinder diameter: 3.54 (90mm). Distance of screw hole: 26cm14cm (10.2″5.5″). Rated…