Trac-Gard N777. FEATURES AND BENEFITS: All weather traction; Bias ply construction; Smooth drive; . OVERVIEW: The Trac-Gard N777 is an all season bias ply tire manufactured for lawn mowers and garden equipment.The tire promotes great all weather traction. The straight-ribbed tread design keeps the tire close to the road surface at all times, while the all weather compound ensures good grip in dry, wet and winter weather. The wide circumferential grooves manage to channel water from the footprint while driving on turf and provide better controllability during such driving. The model's excellent lateral traction is also the result of the ribbed tread pattern that ensures a secure driving experience in all conditions.The model's bias ply construction enables the tire to carry and withstand heavier loads. This allows the tire to be applied to both residential and commercial use. The stronger construction prevents the deformation of the tire's structure under the heavy load pressure, while at the same time offering a smoother performance. The bias 4 ply construction guarantees a comfortable performance as the softer structure lowers the road vibrations felt while the tires are in motion.The N777's special tread design does not damage the grass turf. The straight ribs offer a smooth road contact and they do not feature tread elements that might harm or damage the turf. The gentle traction that the tire provides ensures a safe and comfortable driving experience.This is a bias ply tire. Due to the tire's internal construction and size, it is possible that the tire will look deformed. Smaller bias ply tires do not have reinforced constructions that can keep the tire from deforming. The bias construction and the small tire's non-reinforced internal structure allow the tire to fold in when it is deflated or not properly inflated. This is not constructional damage or an issue; it is a normal occurrence with such tires. In such cases, the tire needs to be mounted and inflated to the proper PSI or, in some instances, an inner tube needs to be added. The proper PSI and the inner tube are able to maintain the tire's ideal shape, preventing the bias plies from looking deformed. This ensures their performing safety and durability. The photo is a representation of the tire's possible deformation, it does not represent the specific tire model, size, tread pattern and application. This specific tire model features a BIASED ply construction. 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.