The chains are on the 2305 and are from Deere. They were around $90 from the dealer, my father-in-law is a semi-retired farmer and he help put them on. They go on pretty easy over the R4s, and back and forth once and it takes the looseness right out. Just retighten the the links, we are at two links per side, pretty easy install, and well worth the time and money. Deere only recommends rear tire chains, because the fronts ones spin too fast. Works well for me. Fitz /forums/images/graemlins/wink.gif