The study looked at how different types of tractor tires affect how well they grip the ground. They tested radial and bias-ply tires with different lug heights, axle loads, and inflation pressures in a field. Radial tires performed better than bias-ply tires, especially with heavier loads. The grip improved with more weight on the tires but decreased with higher tire pressure. The weight on the tires had the biggest impact on how well they gripped the ground. To get the best grip, choose radial tires with the right lug height, weight on the tires, and tire pressure.