SonexBuilders.net

Can someone help explain this please. My Onex tires are 11x400-5. The tubes Sonex sells and Azusa lists are 3.4/3.00-5. They don't fit very well as the photo shows and they are quite loose in the tire. Sonex says they are the right tubes. Are they really designed to expand this much? Something seems off. It seems like they should be the same size designation as the tire.

The tubes are not meant to be inflated outside of a tire. When they are in the tire they are in a confined space and will fill the gaps you're seeing.