MARTINS INDUSTRIES’ adjustable 3-tier, 4-tier and 5-tier Tire storage shelving racks can store a range of tire/wheel assembly sizes (passenger car, SUV & light truck) in your tire shop, car dealership or small tire warehouse. Easy to assemble. All parts come in one box: Mounting brackets, Floor Fasteners and Wall/Back-to-Back Brackets. Adjustable shelf height according to tire size.