This is an interesting read for sure. All I know is that 'mag wheels' were the hot thin in the 60s and 70s. We always talked about them. But I have only ever seen them one time on some kind of formula car made across the big pond that a guy brought to our autocrosses. There must be a reason 'mag' was a big deal for only a relatively short time. The fire hazard was always my thought but who knows? I guess something that burns and can't be put out even by throwing into a pool is pretty scary.