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Ok I checked and they do make 13.00/14.00R20 tubes, which would be more apropretiate for a 395/85R20 tire. They have two different valve stem options so you have to make sure you get the right ones.

I think they do make a tube that big. If you go to a tire store and ask they should help. It will be in the industrial/ mining books. Even just online I found a listing for a 13.00/14.00R-20/21 on some "exel" site. I will try and remeber to check tomorrow when I'm back at work.

I work in a tire store. It sounds like you know this but you can use a radial tube in both radial and bias tires, but you shouldn't use a bias tube in a radial. Due to that fact we don't stock bias tubes it just doesn't make sense. look at the size marking on the tube (if any) if there is an...