Recommended tire size for 18x8 wheel on B5 S4?

[longtravel]

I hear 2 different things. 225/40-18 and 235/40-18. i understand the 235 are wider, but which one would be most suitable for a summer tire with fairly often tracking?

[VMRWheels]

225/40/18 is the ideal size for your vehicle. But if your going to be tracking pull off the 235/40/18.

-Charles@VMRWheels

[Doc@tirerack]

if the wheel has an ET higher than 35mm. you can do 245/35R18, otherwise stick to 225/40R18 (we show the 235/40R18 may be a little too tall to be a comfortable fit).

[Cole]

I run 245/40/18 on a et 33 and it works fine.

(Fenders rolled, liners trimmed, H&R ultras lowered)