I would not expect that there would be any stress concentration on those inner holes, so those cracks are puzzling. The cracks radiating from the spoke nipple in the last picture is not an uncommon failure for an alloy rim with the stresses of weight and distance. I routinely check our wheels for the later but will have to inspect the innards next time I change tires.
I would be interested if Spinergy has any explanation.
Last edited by Alcanbrad; 03-22-19 at 03:16 PM.