all of which have a relatively minor influence in a well designed transmission the torque applied to the sun gear of a simple planetary gear set must balance the torque applied to the ring gear in proportion to the number of teeth on each of these gears for example the torque applied to a ring gear with twice as many teeth as the sun gear in that set must be twice that applied to the sun gear and must be applied in the same direction the torque applied to the carrier must be equal in magnitude and opposite in direction to the sum of the torque on the sun gear and the torque on the ring gear in a compound planetary gear set the utilization of inner and outer sets of planet gears effects an exchange in the roles of the ring gear and the planet carrier in comparison to a simple planetary gear set for instance if the sun gear is held stationary the planet carrier will rotate in the same direction as the ring gear but the planet carrier with inner and outer sets of planet gears will travel faster than the ring gear rather than slower in a compound planetary gear set having meshing inner and outer sets.