My tires are the same size as yours, and I think our tractors are pretty close to the same overall size with respect to hp and weight. I got my truck/SUV tires before I knew anything about relative size front to rear to mesh with 4wd. I put mine on about 4 yrs ago, and I didn't know anything about sizing for 4wd until I got to this site, about 6 mos ago. My original rear ag tires are gone and I don't know what the roll-out or overall height of the rears are suppose to be. However, I have never had any issues with fronts seeming like they were not in sync with the rears. My rear tire height, groung to top is about 31 3/4 inches. If you get the opportunity, I would be interested in what the ground to top height of yours are. The tires I have are BF Goodrich all terrian T/A radials. LT 285/75 R16, 3 ply sidewall tubeless.