The tires on my hmmwv suck. They do have strong sidewalls though, but when they have no air in them, they do flex a bit. They're also expensive as hell, and if you do find a set, don't get a set that's more than 1 year old. The tires on my HMMWV are only 2 years old and very dry rotted. I believe they're Michelin's, but I can't remember. PLS's use Michelins.