Double Ring Tractor Tire Chains have two 2 1/2 inch hardened double rings attached to two 2 1/2 inch hardened double rings. It forms a necklace type pattern. Double are most popular in the north east United States. Famers prefer this pattern for mud and manure since. The large two and 1/2 inch rings move within each other. The movement of the rings causes a self cleaning effect of mud and manure. The rings moving are ensure an even wear of the cross chains. These are not recommended for on road or plowing. Important: These chains require a minimum of 3 inches of clearance from the fender and tractor body.