I ordered the 850 x 6 Desser tundra tires today. I also have the W62 wheel. The problem is Desser doesn't have an inner tube for this tire with the TR87 90 degree valve stem. I called Matco and they suggested using the closest thing that is available, the 800 x 6 tube with the correct TR87 valve stem. Have any of you done this? I'm giving it a try. It looks like I don't have much choice. I'm hoping that with the combination of low air pressure and only 1 inch difference in outside diameter, it'll work ok. James Thomas