Behind the scenes there are experts who careful design tread patterns for optimum wear and traction. They also formulate the rubber compounds of a tire for peak performance, often in specific conditions including winter weather. This expertise impacts the cost of a tire as do the tests reputable brands perform to ensure reliability. All this knowledge, testing and attention to design detail impacts the cost of a tire. The size of the tire also raises cost with larger tires and those for SUVs and trucks often costing more.