Heavy Duty Tire Chain is made of thicker cross chain and thicker side chain and fasteners. Twisted Link Chains are recommended for pavement and concrete. 2 link snow chains, cross chains occur every other side chain link giving consistent ride with less grip-slip like a 4 link chain. Snow Chains spacing is defined as the number of side chain links skipped between cross chains. For 2 link snow chains, cross chains occur every 2 side chain links. For 4 link tire chain, cross chains occur every 4 side chain link. Optional Tensioner is recommended for maximum life and performance of chains. For easier installation of two and four link chains see our Sno-Chain Ramps.