I do run slightly smaller duals on the front of my 4450 MFWD, due to how much they lean on turns, but I"ve never seen smaller duals on the rear. When they"re in the mud and pulling, the strain would be the same anyway. Might be an axle defect. Have heard of hubs breaking when duals fill with mud. These duals are drive wheels from an old Case combine, held on with J-bolts through the square holes punched in the wheel center- able to torch them round without dismounting the tires or blowing the tube.
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