Please forgive me if this has been asked before, but I couldn't find it in a search.
As some of you know, I just installed Jethro's new rear tire/wheel assemblies. The recommended PSI is 22. When I checked with my tire gauge, they registered 19 PSI. I usually keep the PSI lower on my sports cars for better traction. What do you recommend for my new tractor tires? Should I add more air? I only drive him on grass with some hilly slopes ... and sometimes on the sidewalk and street, but not for very long distances (less than 100 yards).