Armstrong Ski-Trac PC. FEATURES AND BENEFITS: Winter weather traction; Enhanced controllability; High driving comfort levels; . OVERVIEW: The Armstrong Ski-Trac PC is a touring, winter tire manufactured for passenger vehicles. Armstrong offers a 40,000 mile treadwear warranty with new tires of this model. This model was made for winter weather use, but it can be used in all season conditions as well.The tire boosts exceptional winter weather traction by utilizing the durable, winter compound and the detailed, directional tread. The high-density siping placement across the tread area boosts the number of biting edges gripping the road surface, which ensures the tire's ice and snow traction. The winter compound keeps the rubber flexibility in freezing temperatures, upgrading the winter weather performing ability. The circumferential grooves prevent hydroplaning by dispersing water and slush from the footprint, resulting in a safer wet weather performance.The maintained surface contact upgrades the controllability as well. The directional tread design's close surface contact boosts the steering responsiveness and the driving stability. In this manner, the tire is quicker and more precise in its response to the driver's commands, while the structure is secured against the driving pressure affecting the tire. The shoulder block pattern with the high-density siping placement enhances the cornering and maneuvering ability, by firmly gripping the road surface with extra biting edges. The high-density siping placement across the directional footprint improves the braking power, significantly shortening the braking distance. This combination greatly improves the driver's control over the vehicle at all times.The Ski-Trac PC boosts the comfort levels. The directional tread's close surface contact absorbs the shock of driving, decreasing the road vibrations felt by the passengers. As road disturbances are not felt by the passengers, the tire guarantees a comfortable performance even on ice- and snow-covered road surfaces. This results in the passengers' exceptional driving enjoyment. 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.