SLK/R170: SLK new wheels
Either way, I think you are fine, just curious.
For tire size, I would go 225/45R17 and 255/35R18.
By the way, the R170's can fit a R19 wheel with 225/35 tires. So if you wanted to go bigger, you could do 225/40R18 in front and 225/35R19 in rear. If you wanted to stagger the wheel size, or do 225/35R19 all the way around.
Hope this helps!



