This is a rare occasion that I will disagree with Five Lock, the increase in ground contact is approximately 40% (will vary slightly depending on whose chart you are looking at) and to be able to do that on the same rim is a pretty good deal.  It makes a very big difference, and is an awesome tire on that size cart.  I see a bunch of 1000 bushel carts on 900s or 35.5s advertised as floater tires, and that's a joke then.