Pull valve stem, then no danger.
Break tire bead loose from each rim half, this can be difficult on old tires/wheels.
fiddle with and work ring down some so it can be canted and pried off other half.
Or cut tire around the edge, and use cutoff wheel at bead to cut steel cords, if scrapping rim no harm in cutting through the rim as well.

Here's what I do with the RH5 wheels, also remove the rim from center dish.
https://goo.gl/photos/46d2K83gJupQ6vs37
And use front hub and spindle as the swivel.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-