What's the most aggressive Rims, Tires & Offset sizes you can do on a stock fender size FD? Or even Semi Widebody Sizing?

 

You might try checking the Suspension/Wheels/Tires/Brakes section...

They have a handy-dandy chart in the top thread which tells you the wheel and tire sizings which will fit inside the stock wheel wells.

Here, I'll get you a link so you don't strain yourself with the arduous search.

https://www.rx7club.com/suspension-wheels-tires-brakes-20/fd-wheel-tire-sizing-416251/

 

I had 29mm offset up front on a 18x8 with 225 tires and 44 offset on a 18x10 with 275 out back. no rubbing what so ever. All with Tein flex coils.

 

Define your terms... rims, tires, and offset are all variable that affect one another.

To me, nothing with less than 275-285 section tires can be considered "aggressive" at either end no matter what size/offset the wheels are, but it seems that term means something different to some people.

About the widest I've seen on a stock-bodied car (that actually worked) albiet with trimming/rolling was 18x10.5" front w/ 285/30/18, and 18x11" rear w/ 295/30/18. +48 F/R.