Ladder tire chains are also know as "Road Chains". They are recommended for the following conditions: -worn tires -used on pavement or concrete -turf style tires Ladder tire chains are not recommended for deep lug tires, since the crosschain will settle between the tread lugs. Cross Chain Thickness: tire width up 16.9 are 3/8 inch thick. 18.4 and larger are 7/16