Make do with what you have on hand...

I've seen that done several times, but a much neater job of it!  Need to use more uniform tires, and stack them more neatly.

Kathleen

Just so everyone knows, that's not my work...someone sent me that photo they took in Baja.

I've seen folks bolt the tires together, standing on edge, so it looks like a bunch of "0"s strung across.  It works fine.

The fence would need supports that way, though.  Laid flat, they are self-supporting -- need more tires, of course.

Kathleen

it depends, because if you do round pens, no, they don't need supports.

You can also half bury the bottom course, and that anchors the whole thing.  If you bolt them well, just the anchor at the base will hold them in place (no posts).

A post every now and ten isn't a bad idea, though.

In non-desert climates, you would have to perforate the tires for drainage or else deal with the mosquitoes.

I have been thinking of doing something like that  (standing tires on edge and bolting them together) but filling the bottoms of the tires with soil and planting in them..perhaps alpines or something that can take the limited amount of soil. That would take care of the standing water=mosquito problem.
Actually, even if they are lying down, the sidewalls will collect water. I've used them to hold down tarps over hay bales and was quite surprised how much water finds its way into the tires. Maybe fill them with straw and plant something (potatoes?) in them..to fill them with dirt would be a huge job.

They work good stacked like bricks overlaping and filled with earth for weight otherwise the horses just lean on them and knock them over.