wow, i for one would like to see a stretched tire on a 5" wheel
seriously, the stretched tire look that's popular in the german modified car scene was probably influenced by the the japanese street rowdy car gangs (aka bosozuku)
part of the allure of these gangs is to do illegal or unsafe mods to their cars to emulate an exaggerated race car and fantasy manga look:
you see it in some of the wacky jdm model kits:

thanks in part to the internet, jap car enthusiasts around the world are being influenced by this look and may try to copy it
however, the question is whether it's legal or roadworthy and if you can even get a tire shop to install them that way
either way, the premise is more wheel, less tire
the idea is to lower your car to the extreme, and allow the obscene negative camber to keep the wheels from smacking the fender lips
(it's a bit more difficult if you have a live rear axle of course)
again, this is all for appearance, not sensible engineering
but try explaining that to a teenager