The 9th International Conference on Gears 2021 will be held in Garching, Munich at the Gear Research Center (FZG) of the Technical University of Munich from September 15th - 17th, 2021. Supported by national and international associations, the conference brings together over 500 leading experts from the international gear and transmission industry. Participating the conference gives you the opportunity to take part in this leading international forum and learn about the latest developments and research results in the powertrain industry and academia. Topics include: the optimization of gear design and geometry, system-modelling, simulation and calculation of gears, new calculation methods for load carrying capacity, strength and efficiency, NVH behavior and noise reduction of transmission systems, condition monitoring and damage detection, EHL contact, and quality assurance and measurement.