When a forklifts center of gravity is directly above its wheelbase they are generally a very stable piece of equipment. The most common forklift tip overs occur when the unit tips either forward or to one side. Sideways Tip Overs occur when a forklifts centre of gravity shifts too far to the left or right of the wheelbase, which can occur during sharp or sudden turns. Forward Tip Overs occur when a forklifts center of gravity shifts too far forward, which can happen when it is being driven down a ramp. Credit to Adaptalift Group