ST939 12R22.5 295/80R22.5 295/80R22.5 315/80R22.5 315/80R22.5 11.00R22 11.00R22 The all-position radial optimized for steel axles in regional and highway sevice. FEATURES Buttress Shoulder Full-depth sipes Full-width protector ply BENEFITS Helps resist wear in high scrub applications. Offer exceptional traction throughout the usable tire life Helps protect the working plies from bruises and penetration,and helps lower down time.