Originally Posted by strelnik

ET stands for the German word " Einpresstiefe" which is the depth of the offset as shown in the three attached rims, which look suspiciously like Bundt rims.

Following this logic, if the Bundt rims are 30mm positive ET, then that Means there's a lot of room inside to fill, perhaps with a spacer.

You see, I plan on putting these Bundts on a slightly lifted smart car.