quality:correction
Drive system

Each rover has six aluminium wheels mounted on a rocker-bogie suspension system, similar to that on Sojourner, that ensures wheels remain on the ground while driving over rough terrain. The design reduces the range of motion of the rover body by half, and allows the rover to go over obstacles or through holes (depressions) that are more than a wheel diameter (250 millimeters (9.8 in)) in size. The rover wheels are designed with integral compliant flexures which provide shock absorption during movement. Additionally, the wheels have cleats which provide grip for climbing in soft sand and scrambling over rocks.