hey man, arent you meant to stack tyres with rims when not in use?

with no rims you can store them like what you have!

Stacking would take up too much room in my garage. This way I prevent damage to the wheels from them rubbing against each other. The tires are supported by two pieces of angle iron that are 'cupped' to hold the tires with minimal contact to eliminate the "flat spotting" that would occur if they were on a flat surface.