Martins Industries' adjustable tire shelves are designed to store your customers' tires and new tires "on tread." Three models are available including three-tier, four-tier and five-tier. Each tier can handle nine to 11 tires or a maximum of 500 pounds per tier. They are designed with a 45-degree angle to sit the tire properly in the rack. The shelves are adjustable in 1-1/2-inch increments, allowing the tiers to be adjusted to suit the tire sizes. Martins says storing tires on tread will save you time by quickly offering access to each tire.