Originally Posted by JDCrow
I think its a scale appearance feature.
Look at the inside bead on the left front wheel in the image.
It could still be a single beadlock on the outside. For awhile at my local track guys were fully gluing the outside bead but only tacking down the inside with 4 dabs of CA. That way if you liked the tires but wanted to change foams, it wasn't a big deal to snap those 4 spots, flip the tire inside-out, and make the change.
This could be the same way, only beefed-up for bigblock nitro. Glue the inside, but put a beadlock on the outside.