Tyre width help please

[Compkiler]

It's gona be that time soon where I'm gona be getting some new tyres!
Thinking about the good year F1 assymetric!
These will be on the standard 18 '' in 225/40

Just Wonderd what size tyre I could go for in these to make it look more squat and grip better or do I have to keep with these size tyres for these wheels? I already have 13mm spacers on the back!

Ta lads

 

[JamesWoj]

I have run Good Year F1 Assymetric tyres on other cars and I felt they were really good tyres compared to others I have had. Don't know if it helps but i'm running B6 S4 wheels which are a 46 offset and 8" wide with 235 width tyres. I did run 5mm spacers but they caught the arch too much so i've taken them off and removed the screw and mount which connects the arch liner to the bumper and it only catches slightly on really big bumps. Photo of my car below if it helps at all (lowered on FK coilovers):

With 5mm spacers


Without 5mm spacers