Did not really know where to post this, but I am re-doing every one of my tires with freshly painted rims. Some are good enough for tubeless and some need new tubes. I found heavy duty Korean tubes reasonably priced, but paying 4 bucks for a pair of bubble packed shrader valves hurts a bit when you need 20 of them. NAPA has them in bulk packs of 50 and they sold me 10 each of each hole diameter for less than 40 cents each. BTW, i also found 4 ply aggressive ATV tires for $80.00 the pair up the road at a go-kart supply store. Thinking about the 520 as a dedicated snow pusher just because of so many problems with properly powering a PTO for the mower.