I'll go out in a minute and see what I might scrape up for sources.
As far as size, the ground under a trailing wheel in a field is going to be irregular enough that 1/2" in radius isn't going to really mess you up. A more significant undersize could easily be cured by lifting the plow a notch or two if the smaller wheel lets it run too deep to pull. An oversize wheel, to my mind, would be more of a problem in that it might keep you from cutting as deeply as you want to, or tip the plow forward to where it's biting at a steeper angle than works well.
I'll look at some old catalogs and google a little on the tires and see what I can come up with and let ya know.
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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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