I came across some 20x8.5 rims without tires. I want to know what is the widest tire I can fit all around , Pics would be nice to kinda get a better look on 6th gen.

 

To start, it's hard for anyone to give you a good guess without details about the car and wheels. If the car is lowered (or if you have a huge sound system on stock suspension), that could limit how wide you can go. Also, the specs of the wheels make a big difference too. Having a wacky offset could limit how much tire you can run.

With that said, in general, plenty of people have done 245s with no issue, and some have done 255s. I don't think I've seen wider than that without mods (iirc there was a gtp guy that did 275s all around with modding to make them fit).

Realistically an 8.5" wheel is only about 215mm wide, so it's not like you're going to be able to run 325s or anything like that. 245s or 255s are about as wide as I'd go on an 8.5"

 

I don't have anything in the trunk. The rims I have are Zinik Verona 20x8.5 with a 42 offset. Iam currently on stock suspension.