I'll measure a spare lip tonight.
Btw, found an old convo between Jake and I when he was helping me build my VS-XX.
When measuring your current lip, , measure from the inner flange (where the barrels/faces/outer lips meet) to the outer flange (outermost portion of the rim) and subtract 1/2". That'll give you your current lip size, then just add an inch to that to get your desired specs
When you measure a wheel, the reported specs are from bead to bead, NOT from the outermost portions of each lip. For example, a 10" rim will measure 11" from the outermost portions of each barrel, but it will measure 10" from bead-to-bead. If you think about it, it makes perfect sense, because you order tire size based on bead width, not overall rim width. So you subtract a 1/2" from just the outer lip measurement in order to give you the effective width of the lip, not the physical width.