Well,here we go,so, I will add,this is first tractor I have had with r-4's,and like them.
They are not racing slicks like some say[for some reason],have used mine in mud and some snow and find they work out just as well for me as the other tractor with ag's.
Can't imagine how anyone would have problems with them in dry dirt??
Now do they dig as good as ag's,no of course not,look at the tread,but they work fine for me,got 1/2 acre garden,got 8-10 acres of hilly trails and fields I mow,never had any problems yet.
Many people run to much air in them,I got my rears loaded and about 19 lbs of air[plus the kioti ck30 is a pretty heavy tractor for its size]
Maybe on some of them little light deeres and kuboto's,that light weight,would make all the difference.
Now,on to the advantages,they are wider,and if you get them loaded,they really seem to help on side of hill,thats a fact. They are supposed to be tougher and last longer,[can't tell for sure about that,but believe it nonethe less].
They don't make ruts from the bar tread like ag's,thats a fact. And they are smoother riding than ag's,thats a fact too.
None work on ice good,and would believe on ice,r-4's would be better than ag's[not snow,but ice].
Your turn.