Last month, Titan, maker of Titan and Goodyear Farm Tires, held a two-day summit for dealers, giving them a brush-up on new tire technology. The reason for the summit, organizers say, is that farm equipment keeps evolving with each new model year, with bigger engines and heavier, more powerful machines. With those changes come some challenges, such as road lope, power hop and soil compaction. Tires need to change in suit. So the company invited dealers back to school to learn how the tires they sell can meet those challenges.