I bought a foldable carry cart, but when I used it for long distance transportation, the soft rubber wheel part broke soon, and it fell off the axle of the plaque. For that reason, I used it for tire change, but the axle diameter was perfect. I pulled out the axle of the carry cart, cut the head of the pin, exchanged the wheel, opened a 2 mm hole with a drill, stopped the new wheel with the R pin, but it is very good. We carry books that are somewhat heavy, but there is no problem at all. Thank you for a good product.