A coaxial multi-member mechanism for using as the front axle and the rear axle in an electric vehicle is presented to allow the wheels of the vehicle changing the track widths from a wide track to a narrow track or vice versa in vehicle moving condition. The wide track mode is for safer high speed driving and more collision protection from the four wheels. The narrow track is used on the other hand for narrow street and slow speed driving and for easy parking in a narrow space.

Vehicles are disclosed which have a lower center of gravity than existing all-terrain, amphibious, and unmanned ground vehicles due to the location of propulsion units and other vehicle components inside the wheels of the vehicle. The vehicles can climb over large obstacles yet are also able to corner at high speeds. The vehicles can be configured for direct manual operation or operation by remote control, and can also be configured for a wide variety of missions.

Vehicles are disclosed which have a lower center of gravity than existing all-terrain, amphibious, and unmanned ground vehicles due to the location of propulsion units and other vehicle components inside the wheels of the vehicle. The vehicles can climb over large obstacles yet are also able to corner at high speeds. The vehicles can be configured for direct manual operation or operation by remote control, and can also be configured for a wide variety of missions.

A wheel control system controls a wheel of a vehicle and includes a knuckle supporting the wheel and controlling a direction of the wheel. The system also includes a wheel control device connected to the knuckle and capable of controlling movement of the knuckle. The wheel control device may be supported on a chassis of the vehicle. The wheel control device may include an actuator arm including a linear actuator.