I have recently acquired a Belarus 420 from 1981, I have never really delt with anything maintenance wise on a tractor, but am looking to find a decent used set of tires fronts or rears. Or both if possible Near Edmonton, AB the Tires I currently have say U.S.S.R so that means they are pretty close to 30 years old atleast, and they may even be the originals being closer to 40 years old, I have no idea what a new set should be worth, and what prices would be too much/ over charging. In addition to that what should I be expecting to pay a shop for a change over as I know they are not car or truck tires and am expecting the prices to reflect that based upon hearing 1500-2500/ tire