The oldest tractor in the picture is a 1946 steel wheel, made just at the end of the world war.  there was a rubber shortage during the war sending all the rubber to the military.  I don't mind at all because you cant get this beast stuck even if y0u tried.  It runs perfect.  Now..... I have a 1999 Dodge Durango that is falling apart and is a turd mobile.  In my opinion this is why our car manufacturers have been failing.  Why cant us Americans have the pride and quality that came out of that era.  It blows my mind.  I work on my truck more than I do my tractor. We Love anything old.  There's a reason the products lasted this long. We even have a working 1930's era dairy cream separator that we found at a farm auction.  We just haven't put it to use yet.