Hi I have a 1989 polo breadvan lowered 60/40 and I was wondering if anyone knew the widest you can band the stock wheels without any rub?

Thanks to the design of the breadvan arches 6j is about as big as you can go without doing any arch work. Depends on the tyre choice also but generally 6j is about as wide as you can go on a breadvan.

Any wider and you're likely to need to do arch work, which personally I think any more than folding the lip in just ruins the look of a breadvan.