Less effort needed to discharge the drum of the concrete mixer, through the big and strong little gear. The blades construction ensures easy replacement, as they are bolded and not welded. The wheels are made of solid rubber and designed to grant the maximum traction of the mixer on the ground. Shock absorber system for diesel engine cement mixers protects the structure of the frame and reduces vibrations during use. The optimal mix of the material is granted by the specific shape and disposition of the blades, the drum rotating in both directions ensure the mixing in one direction, and the discharging in the other.