A wheel drive assembly that can include a motor having an output shaft, a
wheel mount that is adapted to have a wheel mounted thereto, a wheel
shaft with a first end drivingly coupled to the wheel mount, and a
clutch. The clutch can have a first body, a second body, and a plurality
of sliders. The first body of the clutch can be coupled for rotation with
the wheel shaft, and the second body of the clutch can be coupled for
rotation with the output shaft of the motor. The sliders of the clutch
can be movably mounted to the first body and biased into engagement with
the second body. At a rotational speed above a predetermined speed, the
sliders can move radially outwardly and disengage the second body.