On Jun 29, 9:45 am, Jim wrote:
Popped the bead on my 11 x 4.00 - 4 riding mower tubeless tire. Trying
to remount it has been an example of continued frustration.

Googling mounting of these tires found many responses saying just go
ahead and use tubes. Online search turns up some for 5" tire but not 4".

Any known sources?

Maybe you could try wrapping a belt or slip-knotted cord around the
perimeter of the tire and cinching it down while putting the air chuck
to the valve stem. This pushes the tire bead out towards the wheel
rim, and if you're lucky, it'll catch. Tom