Yokohama Y870B. FEATURES AND BENEFITS: Temporary spare tire; All season traction; Enhanced controllability; . OVERVIEW: The Yokohama Y870B (GZ) is an all season tire manufactured for passenger vehicles and SUVs. It is the original equipment tire of select Subaru vehicles.This is a temporary spare tire, which was designed to be used when one of the vehicle's regular tires fails. These tires are made with a smaller physical size, which helps conserve trunk space. However, this also comes with some downsides. Such tires are not as strong as regular tires and, due to this, they are only for temporary use at moderate speeds. Still, they are an excellent spare tire choice.The tread design and the all season compound offer good traction. Their combination provides road grip in dry, wet, and light winter conditions. The tread block pattern and the groove placement follow the road and generate the necessary biting edges to create traction. The compound keeps the tire pliable in various temperatures, enabling its safer performance.The Yokohama Y870B (GZ) utilizes its footprint to ensure road contact as well. The tread design helps improve steering responsiveness and driving stability in this manner. They boost steering responses and accuracy to the driver's commands, while the structure is secured against driving pressure. This results in a secure driving experience.This is a bias ply or diagonal tire. Due to the tire's internal construction and size, it is possible that the tire will look deformed. Smaller diagonal 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.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.