A wheel assembly for use in a bin sweep system having a sweep auger, the wheel assembly comprising: an input shaft adapted for driven engagement with the sweep auger, a wheel, and a cycloidal drive driven by the input shaft to drive the wheel at a reduced speed, the cycloidal drive including an eccentric bearing coupled to the input shaft and including a center offset from an axis for effectuating orbital motion as the input shaft rotates about axis, a movable drive gear coupled to the eccentric bearing and concentric with the eccentric bearing, a stationary drive plate coupled to the input shaft by way of a bearing such that the stationary drive plate does not rotate with the input shaft, characterized in that, the cycloidal drive further including: the stationary drive plate defining apertures for receiving drive pins, a movable ring gear coupled to the movable drive gear for relative rotation in the same direction as the drive shaft, ring pins coupled to the movable ring gear for meshing with and being driven by teeth of the movable drive gear, and drive pins fixed with respect to, and extending axially from, the movable drive gear, the drive pins being received in the apertures of the stationary drive plate, whereby the apertures have a greater diameter than the diameter of the drive pins for orbital movement within the apertures. an input shaft adapted for driven engagement with the sweep auger, a wheel, and a cycloidal drive driven by the input shaft to drive the wheel at a reduced speed, the cycloidal drive including an eccentric bearing coupled to the input shaft and including a center offset from an axis for effectuating orbital motion as the input shaft rotates about axis, a movable drive gear coupled to the eccentric bearing and concentric with the eccentric bearing, a stationary drive plate coupled to the input shaft by way of a bearing such that the stationary drive plate does not rotate with the input shaft, characterized in that, the cycloidal drive further including: the stationary drive plate defining apertures for receiving drive pins, a movable ring gear coupled to the movable drive gear for relative rotation in the same direction as the drive shaft, ring pins coupled to the movable ring gear for meshing with and being driven by teeth of the movable drive gear, and drive pins fixed with respect to, and extending axially from, the movable drive gear, the drive pins being received in the apertures of the stationary drive plate, whereby the apertures have a greater diameter than the diameter of the drive pins for orbital movement within the apertures. the stationary drive plate defining apertures for receiving drive pins, a movable ring gear coupled to the movable drive gear for relative rotation in the same direction as the drive shaft, ring pins coupled to the movable ring gear for meshing with and being driven by teeth of the movable drive gear, and drive pins fixed with respect to, and extending axially from, the movable drive gear, the drive pins being received in the apertures of the stationary drive plate, whereby the apertures have a greater diameter than the diameter of the drive pins for orbital movement within the apertures.