I have a MF 165, the rear tires are not loaded. When I bought it used, the rims were corroded and leaking. I replaced the rims and tires but chose not to load them because I work some muck and thought it might be more of a hindrance than a help. Although on the heavier ground and other tasks I wish I had the ballast, anyway I can't get around in the snow worth a darn. I'm thinking chains would be a real help. New ones are pricey for my budget, I see a bunch on marketplace but they just give the dimensions. Can anyone tell me what size I would need for 16.9- 24 tires? And any other advice, thanks.