That's great you had a good outcome but honestly part of the tyre fitting process invloves immersing the rims and newly

fitted over inflated tyres ( typically to the maximum pressure inscribed onto the tyre) into water to check for bead

leaks/cracks etc which obviously show up as bubbles..

There are other methods for rim crack detection but they are quite expensive afaik and normally reserved for rim

wholesalers and rim repairers.

I find it highly unlikely that cracked rims that allowed tyres to become deflated in (at most?) a 30hr period were not

bubbling their head off when tested post fitting.

That two rims also decided to crack at the same time is also unlikely with the common denominator being the fitter and

the fitting machine.

I wondered, out of interest, what type of rims ie. steel or alloy and what brand of vehicle?

NB. If the rims are 20's or 22's then the damage during fitting scenario is a definite possibility because some of them

appear to have the structural integrity of used aluminium foil.