The tire size is 12.4-16 for the R4's, not 15-19.5 as posted.
You are looking at a total of 375-415lbs extra weight depending on the solution. (187-207lb per tire)
I checked. It is 12.4 x 16.
thanks
You could be right...I'm not a Kubota guy..
However, 12.4-16 are listed as R-1 Ag tires, not R-4's.
As 15-19.5 are one of the most used (if not the most used) R-4 sizes on compacts (not just Kubota), I made an assumption.
Correct me if I'm wrong, but please check the tire sidewall on you tractor first (if you have a B3200).
Kubota uses the 12.4-16 size for both R4 and R1 tires on the B3200, I have a set of each for mine....