Abstract: A steering wheel controller is mountable to a steering wheel of a vehicle having a steering wheel axis and rim, the steering wheel rim having hand gripping surfaces that face away from the steering wheel axis. The steering wheel controller includes a steering wheel mount, a wheel ring, and at least one ring driver. The steering wheel mount is securable to the steering wheel without obstructing the hand gripping surfaces. The wheel ring is connected to the steering wheel mount, and defines a wheel ring axis of rotation. When the steering wheel mount is secured to the steering wheel, the wheel ring is located rearward of the steering wheel. The at least one ring driver is engageable with the wheel ring, and when engaged with the wheel ring controllable to selectively torque the wheel ring to rotate with the steering wheel mount about the wheel ring axis of rotation.