The 13.6 has more flotation as it is both an inch wider and taller in section of tire but total 2 inches taller total installed. So that difference will make a difference in speed and power to ground as more speed translates to less pulling power. If you are using your tractor on soft surfaces then the 13.6, if you are wanting a slow speed for say a finniching mower then the 12.4. The 13.6 will give you a faster road speed but you could not pull as much of a load. So is it a working tractor or a play tractor and what kind of work or what kind of play would it be doing. That could make the difference in what you could use. Just a tractor drive tractor the 13.6, for pulling a disk then the 12.4 as you would be shorter on power with the 13.6. I have a 44 2N that came new on 10x28 that is now 11.2x28. In 46 it was fitted with new tires of 11x28 that is now a 12.4x28 because we needed more traction for plowing and disking, but a 13.6 would have cut power too much for that but have given more traction. Is the 850 a Ford or a John Deere? The 850 Ford is a 44 PTO horsepower tractor with a 5 speed transmission but no live PTO and easily would in most contitions handle a 3-14" plow while the 2N is a 23 PTO horsepower tractor and a 2-12" plow size so the 850 needs a bigger tire to handle the load. 850 Deere is a compact that I actually know nothing about. So it comes down to what you plan on doing with your tractors. The 850 ford came new with a 2" wider and 2" taller sidewal tire than the 2N. With the 13.6 tire you would be going with a 1" wider and 1" taller sidewall tire than the 12.4 tire. So it should come down to what you want to do with the 2N. For work I would look for a 12.4 tire, just for tractor drive probably the 13'6 tire due to more road speed. But if you have the Sherman over drive or over and under drive you would not want the extra speed from the 13'6 tire.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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