I got whatever chains JD sells, round link, but they were only 4-link style; I did not know any better at the time, so I never thought to ask. I added extra cross links to make them 2-link, using grade 70 3/8" chain. I've only got maybe 20-30 hrs on them, but have not broken one yet doing hard pack, mostly. They make a huge difference. I was breaking military truck chains in as little as an hour w/ my smaller loader, so I abandoned them; allegedly they were for "2 ton trucks", but they were only about 5/16". To tighten mine, I was breaking 3/8" turn-buckles that went on diameters across the tires, so I am now using two short 5/16" chains that I draw together w/ a 3/8" bolt to make an X, if that makes sense. So far, so good, and the chains are as tight as can be. I have not tried letting air out, putting on chains, and blowing back up, but when one tire was down to about 10 psi, I hardly noticed, so I don't think they'll shrink much when deflated. Getting off subject, so I'll quit.