The compact and sturdy 4-tier Tire shelving rack with tires positioned on tread increases your storage efficiency while keeping your warehouse tidy. Easily locate and pick the right passenger car or SUV tires or tire/wheel assemblies without having to handle other tires like with barrel stacked tire setups. The 4-tier tire storage rack being practically boltless, it is easy to assemble.*Also available in 3-tier & 5-tier.