My rear wheels are rusted out. The tractor (Ford 1620 4WD) currently has Firestone Turf and Field tires which have worked pretty well. As I replace the rear wheels, I wonder if it would be more cost-effective to change to AG R1 wheels and tires. I realize I may have to change the fronts as well. Any assistance would be greatly appreciated as this is not my field of expertise. The tractor was purchased used from a mowing service, but I use it for general work around the farm primarily bush hogging.