im looking to get are ADVAN RG-II`s.

the Q is whats the widest i can go with stock fenders?
18`s

size and offset would be nice...

thanks

 

did you look at the wheel fitment guide at the top of the wheel/tire forum?

 

There is no real set answer. It would all depend on the width of the wheel and the size of the tire you go with. My rule would be to go with the highest offset and go from there. The rear should be around 55 to 65 mm offset.