Fake parts molded in robot mode. Fake tires, fake anything. They look bad, especially when they're left unpainted. Just assume the fact that some alt mode parts don't end where they should, we're okay with it. Looking at you, DOTM Voyager Prime with your fake wheels on the hips, Prime Voyager Bulkhead with your fake tires in the middle of the feet, Prime Deluxe Cliffjumper... you get the idea.