Solid plastic wheels, which can’t deflate! I had a similar cart with pneumatic tires, two of which would not hold air. The solid plastic wheels were a big selling point for me. This hose cart was a chore to assemble. Took me a little more than an hour. Once I got it assembled, I noticed that the threads where the hose attaches to the spool are right up against a brace on the spool. No way to attach a hose without modification. I ended up bending the threaded hose attachment away from the brace with a crowbar. Only then was I able to attach a hose. One star deducted for that manufacturing error. The assembled cart rolls easily on pavement. Spool winds hose smoothly. This will be stored outdoors. I suspect the metal will oxidize over time. Would hold up better if powder coated. Overall I’m happy with the purchase. Certainly an improvement over the hose cart this one replaces.