Tire type is an important factor when it comes to vehicle safety and performance. RETREAD (7 letters) is a type of tire that has been used before, but has been refurbished with new treads. Whitewall (9 letters) tires are characterized by a white stripe around the circumference of the tire. RADIAL (6 letters) tires are designed with the cords running perpendicular to the direction of travel, providing better handling and fuel efficiency. SPARE (5 letters) tires are typically smaller than regular tires and are used as a temporary replacement in case of a flat tire.