If you are going to load a tube, it really needs to have a TR-4 or a TR-6 valve stem. They bolt to the rim, and do several things. 1.) They make putting the fluid in easier. 2.) Loaded tires can have a tendency to spin the rim in the tire because of the lower pressure. This helps prevent it. 3.) They tend not to have leak issues and handle fluid better.
I have loaded tires on the 1811. One is a TR-4 stem, the other is a regular tube. Regular tube leaks on the valve stem and the stem is getting soft. I'm going to have to replace the tube. The TR-4 stem tube: no leaks.
Here's the issue: I can't find them anymore. Last time I went to order another set to add fluid to another machine, they told me they were discontinued for the 8.50/10/50X12 tires. Soooooo.... I haven't done it yet. However, over in the ATV world, they have a tube for a 12" rim, but it was either a little narrower, or wider (I don't remember) with the TR-4 stem. I was going to buy a set of those and try them. I really think they would work fine.
I've messed with a lot of fluid filled tires on bigger tractors/machines. This is stuff I've learned through the years. Just my
