If it is squirrily at speeds, you may just need an alignment. You really can't go by the book on this since the bigger tires. I would have the tires tilted in at least a 1/4-3/8" ON BOTH SIDES so as you are looking at the front of the cart, it should look like this \ / And adjust the tie rod so you have at least 3/8-1/2" when standing in front looking straight down at the tires it would look like this \ / When the tires point together like that, it keeps it going straight down the road even if you hit hard bumps. The only time I ever noticed any squirrillyness is when I had people on the rear seat. It took weight off the front. Trust me on this on. Oh, It won't cause any premature tire wear either. Well, none that I noticed in the 3 years I had the one cart. and one summer I put 1700 miles on it and the tires still looked new.