Step 19: Inflate a Tubeless Tire That's off the Bead
There are several tricks going on here.
I've jacked up the vehicle so the tire can assume its normal shape.
I've wrapped a rope around the tread and tightened it by twisting a crowbar through it. That compresses the tread and forces the sides of the tire out, making it wide enough to engage with the rim.
A ratcheting tiedown strap is good for that also, but I didn't have one handy.
It would also be good to smear thick soap all over the bead and rim like they do at a tire shop.
I'm blowing air under the lip of the tire with an airgun. You can get a lot more air into the tire in a hurry that way to make it jump onto the rim.