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ppm..... ..re: yer lopp-sized reartires, while not quite like yer belchfire V-8 diffy, its generally not good to run major tire-size differences 'cuz it'll work yer diffy spider gears all the time and will eventually make them whine. Your factory original reartire size was 10-28, re-numbered by gov't safety bureaucrats to 11.2-28 in 1970's. Your 11-28 is already 1-size too large, and the 13.6-28 is 2-sizes too large. (12-28 before re-number) Iff'n the rim-widths were also changed, yer probably ok; iff'n not correct rim-width, yer stiff-walled reartires are gonna be major wear down the center. Probably not a major tire factor in 25yr life of rear ag-bar tires. Iff'n yer N-Tractor was extensively used as a "plowing" tractor, sometimes they oversized the furrow tire for added traction and to kinda keep the tractor more level so diffy oil don't leak past the seal and greeze the brakes. Sometimes majorly used oversized ag-bar reartires are viable tire alternative with light-weight low time useage N-Tractors. But BIG reartires add to OVERDRIVE effect of underpowered engine..... ...Dell, who has 14.9-24 ag-bar tires (same outside diameter at 10-28)
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