No guess here, but it's a bad idea. I have been witness to a few companies that went the 'cheap way' because they wanted to convert to aluminum from steel, but didn't want to shell out the dough for the longer studs that the aluminum wheels require. The solution? Yep, you guessed it, steel on the inside, aluminum on the outside. Sounds simple enough, the problem is that aluminum wheels flex much more than the steel ones and as a result, countless numbers of broken steel wheels eating up tires, studs, the aluminum rim on the outside and in some cases, even the brake drums.