Forerunner QH621. FEATURES AND BENEFITS: Versatile terrain traction; Field-friendly performance; Upgraded load durability; . OVERVIEW: The Forerunner QH621 is an all season tire manufactured for tractors.The optimized tread elements significantly improve the model's different terrain traction. The optimized tread elements and a high void ratio improve the tire's soft and loose field and on-road traction. The ideal footprint enhances the performance, guaranteeing the tire's forward motion at all times. The tread manages to keep the footprint clean, by eliminating mud, snow, and rocks stuck between the tread elements. This greatly increases the model's driving safety levels on versatile terrains.Better soft traction ensures the tire's optimized field-friendly drive. The optimized tread elements and its soft traction minimize the pressure placed on the driving surface, upgrading the tire's high flotation ability. In this manner, the tire prevents excessive pressure build-up during the off-road drive, which prevents traction from loosening up the driving surface. The reduced pressure levels avoid soil retention from ruining the soil quality, which ensures the field's excellent crop-growing ability.The Forerunner QH621 ensures great load and driving durability with its reinforced internal structure. Tires can deform under load pressure if their construction is not strong enough. Therefore, by reinforcing the sidewalls of this tire, it is able to securely handle larger loads. Great load capacity is ensured as the tire manages to increase its ability to carry and withstand such loads.This specific tire model features a BIASED ply construction. There might be discrepancies of sizes between brands and models of tires which have this size formatting. As the manufacturers only provide the tire width and the rim diameter with these tires, various brands and models will have size differences. In order to ensure the correct size is purchased, the overall tire diameter that is needed should be checked.This is a Tubed Type Tire (TT), which requires an inner tube to properly function. This purchase does not include the inner tube or flaps.The Overall Diameter or O.D. advertised represents the tire's overall diameter in inches, once the tire has been properly inflated and mounted per the manufacturer's recommendation. This advertised number is provided to Priority Tire by the tire manufacturer.Manufacturers recommend changing tires every 10 years. As long as tires are properly stored before they are sold, the year of their manufacture will not shorten their service life.