I used to work I'm the metal industry. normally that much rust takes several years to get half that bad. methinks it came out of the factory in that condition and should have never passed inspection before shipping
also a possibility, I have heard of that but never saw it happen that fast. Is it possible that water might have gotten in there and not have ben allowed to escape?This is the second time the tire has been changed. The first time there was just very small areas that I assumed were just surface rust. Didn't think much of that and just replaced the tire. These pits came as quite a shock actually. To me they look like the result of the rim being made from a very poor batch of metal with a lot of impurities in it that have corroded quickly.