Are there any approved LSR tires larger than 30"?
several.... look at a couple of the big rigs using large aircraft tires. Read a little about the Phoenix, there is a thread with links in General Chat
I believe I'd have to run the aircraft tires through the approval process. At $1000 each, and about the same for getting custom 2-piece wheels made to hold them plus another thousand for testing, it is way beyond my resources. It's still very interesting, and they come in a huge assortment of different sizes.
My fantasy tire would be 34" tall on a 16-18" rim, but that means aircraft only.
My guess is I will be running the Mickey Thompson 30" tires and just have to change the axles to get enough gear. A 32"+ tire will give me 200mph capability without putting lightweight axles under it. Nice thing about our trucks, is that the 11.5" ring and pinion is pretty much indestructible, but guys who have played with 12-bolts, 9" Fords, and quick changes have destroyed them in diesel applications.