Typically you want your rim 1" narrower than your tire (13.6 tire...12" rim). However you can go a couple inches either way and depending on what the tractor is used for, it wont make on bit of difference. Obviously a narrower rim will balloon out the tread and a wider rim will flatten it out... Measure rim width from the inside the bead seat to the inside of the other bead seat. No need to measure across the rim...they are 38" rims unless someone has change your rear hubs with some high crop ones.
13.6s or 14.9s both look good on an M. Some even run 15.5"s...
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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