Advantages: Simultaneously loading of many teeth. Smooth running. Gears with many very small numbers of teeth can be realized with. All types of gears can be realized with cycloidal toothings. Advantageous compression ratios with external -/ external toothings. Disadvantages: High glide speed. slight tooth power in value and direction around the servicing point. High contact pressure with convex surfaces. Profile displacement not possible. The axial distance must be kept very accurate. Only then the transmission is based on a constant angle of revolution. Disadvatageous comprtession ratios with external -/ internal toothings.