I think the problem they are having is that they cant get the bead to hold air when trying to seat it on the rim. I have had this problem with tires that have been shipped stacked with the tread from one sitting in the center of another- this forces the bead to collapse to the center of the tire.

They can either use a bead blaster or do like I do in my home shop- get a 20" bicycle tube, partially inflate it and use the tube to fill the gap between the tire and the rim. Lube with RuGlyde and when the tire starts to fill, work the bike tube out from the gap. If they are careful, you can get several uses from a single tube. You should have more than one on hand...

HTH

__________________
Dave

'05 325xi
'10 E70 35d
'85 911 Carrera
'66 911 Work in progress
'91 Chevy C1500
'95 Jeep Cherokee
‘18 Jeep JLU