I have a scion tc with tein s tech springs on and i want to purchase rims for it. I was looking at a set of 18x8 with either 225/40-18 or 235/40-18 and i was wondering if anyone knows if it will rub and will i be able to turn without rubbing.

 

Offset?

 

+40mm

 

Stick with the 225s

 

You would probably rub on dips (if taken at higher speeds) and U-turns. With a +40 offset though, rubbing should be minimal.
Also, stick with 225s.