The FZG hypoid gear test rig was developed for life tests on bevel and hypoid gears. Like the FZG back-to-back gear test rig, this rig operates on the principle of the mechanical power circuit. The test bevel or hypoid gearbox is loaded by a second, larger dimensioned hypoid gearbox and a cylindrical gear stage. The test rig is used for the examination of tooth root and tooth flank load-carrying capacity, as well as for hypoid gear oil tests. Following the FZG scuffing test for cylindrical gears, test methods for scuffing and wear behaviour have been developed.