Contact the manufacturer. I have a Worksman front loader (sort of a 2 in front one in the rear a.k.a. tadpole configuration three wheeler) that has 2 X 20" front wheels, and it's rated for 225Kg. The wheels are built to a higher specification because of use. Folding bikes are usually built to be relatively light weight. Probably each tire on your foldy had a 65Kg limit, so 130Kg for both. Use correct tire pressure, of course. How much is the total load, i.e. you + kid + gear (backpacks full of fun, etc) = load. Blow a tire is not too common, but can happen. And relatively easy to replace. Fold a wheel and you'll need to re-build it, or replace it.