The tires are pneumatic with tubes. On my third use, one of the tubes blew and I am having a very hard time finding a new tube. The blow out was huge and not a patch-able hole. I have contacted the company and my warranty is currently being reviewed to see if I am covered for this damage. (I purchased this cart less than a month ago.) I have found a tube on Amazon but I won't get it for at least 2 weeks. I think there was a tire upgrade option offered when I purchased the cart. I wish I had paid more attention to that. The tires were mentioned in several remarks but the positive remarks were persuasive. If you purchase this cart, make sure you have back up tubes available (they aren't your standard 8 inch tubes) or pay for the upgrade. I purchased this cart because I am over 70, maintain a huge yard, have a difficult time using my wheel barrow, and liked the idea of the loop handle that makes is possible to pull as well as push.