Transverse flexibility or rigidity of the belt is another significant consideration. It is important that the belt trough properly. The empty conveyor belt must make sufficient contact with the center roll in order to track properly. In the example shown below, the top belt is too stiff to contact the center rolls, and therefore, will wander from side to side with the possibility of causing considerable damage to the belt edges and to the structure. The bottom belt shows sufficient contact with the center roll and is the condition we strive for. The Troughability Table in the specification pages tells you that belt width exceeds a given dimension based upon the troughing angle of the idler systems.