Changing to different sizes of tyre isn’t always as straightforward as finding the same make and model of tractor on different rubber and then opting to fit them. Mechanical lead is just one of the items to consider, as we discovered.
So, you have the ideal used tractor but it isn’t booted with the tyre size that best fits your needs. Don’t fret as you are not alone: this is a topic regularly discussed with tyre product specialists and suppliers.