What type of Goodyear's are you running? I have got the chance of some Brand new Good year Dyna torque 13.6-28 I plough on 12" furrows so I hope I will get away with the extra width, the tyres seem too good to turn down as they have an open centre tred pattern and should clean well I hopeI run 10/12psi on the rear, but mine are GoodYear radials, grip like something else. When I swapped from x ply to radial the traction difference was very significant...