A Couple of Very Big Tires

In the National Museum of the United States Air Force there are many artifacts, ranging from small personal items, to the massive aircraft that scrape the top of the hangers.

The tail of the museum's B-36
But today we'll be looking at a couple of items that are a bit different. Yes, a Couple of Very Big Tires.
First up is one of the only two surviving pieces of the XB-19, one of the main landing gear wheels.

Located in the 'Early Years' hanger, it was easily one of the largest tires in the world in the early 1940s, if not the largest. The Douglas XB-19 was the largest American bomber until the YB-35 flew in 1946, each tire is eight feet across, and it will get a detailed look another day.
The second is one of the initial landing gear for the B-36 prototype, designated the XB-36.

The wheel and strut with a B-36 behind
The XB-36 was to have two of these massive wheels. With a diameter of 110'', 36'' wide, and each weighing 1,320 pounds. However, the massive pressures restricted the XB-36 to a runway adjacent to the factory, and two other runways in the entire United States. It was shortly replaced by a four wheel bogie, which was much more manageable.

Another view of the landing gear, with the final version visible on the left side