I just recently put chains on my 843 - 12x16.5 i went with a v-notch - 4 link ladder chains ( all 4 wheels) this means that every 4th link around the chain has a lateral cross chain, my tires are good years and they are about 50% traction on them. the chains tend to lay down nice but i could see a little performance lost with deep new tread. the important things to look for is - hardened chain of course and a decent size chain. my skid steer has become unstopable in the western ny icy winter, i can go places where the bobcat used to be very frightened to go, she has overcome her fear. i went with the cam lock type which should be checked for tightnes regularly, i have tightened 2 additional links in a month of use and they feel like they are right where i want them, i also heard that letting a bit of air out of the tires could help with fit? hope it's helpful... if you travel in ice/hardpack on moderate terain in a wintery climate, they are essential Ryan