Firestone Duraforce SDT 305/70D16.5 F (12 Ply) AS A/S All Season Tire
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.
This specific tire model features a BIASED ply construction.