There are lots of places to purchase wheels--including soft tires that are filled with a specialized foam to prevent flats. And, because they're relatively small, they're not very expensive. http://www.nextag.com/cart-wheels/shop-html

The R&R carts are unique in their design. I, like many of us that have been in this biz for any length of time, have used lots of other brands and types of carts before R&R became available. After using the R-10 for many years I would never go back to another brand and style.

Gary