This book includes Experimental study of the process of design the truck tire sidewall, which is exposed to constant and variable loads. One of the main requirements of the truck tire sidewall are flexing resistance, tensile strength and tear resistance, as well as resistance to weather conditions experienced by tires during use, which include exposure to sunlight. The requirements and changing circumstances led to develop the design parts of tires, and sidewall is more susceptible to these conditions.The accumulative fatigue damage was studied by the application of Miner's rule to variable amplitude loading and gave a new, important and useful results after rubber and filler selection processes.