</font><font color="blueclass=small">( How difficult is the change? )</font>
Well there is the easy way and the hard way...
Easy way... Remove wheels from tractor. Remove inner wheel from rim. Now take the left side tire/rim and put it on right side inner wheel and other way around for the other side, Install wheels back on tractor.
You have to do as I said above because of the tire tread heading forward.
Hard way... Everything I said above PLUS remove tires from rims. The "hard way" is the way to go for ALL options on how wide or thin you would like to go.
Can you take a close up picture of your wheels now so we can see better. Where is the valve stem? If right now it is pointing to the "inside" of the tractor, doing it the "Easy Way" above will get you to the thinnest track.
I'll go take a good pic of my wheel right now and post it in my pictures here on the forum. I'll post again when the pic is up. My wheels are at the thinnest track.