STI Out & Back MAX Tire - 8 Ply (34x10-17) The STI Out & Back Max tires feature an aggressive tread pattern and true sizing designed to power today's everything through the mud, from large-bore UTVs to mid-size ATVs, and then get them back in comfort. In sizes from 26 inch up to 36 inch, the Out & Back Max tires use stepped-lug construction and a rugged carcass for trusted performance in the sloppiest conditions. Do your mud tires measure up to the Out & Back Max? For large bore UTVs. Aggressive 1.5-inch tread depth in the center, and 2.0-inch depth at the shoulder. Stepped-based lug construction to minimize flex and maximize traction.