if you go for 17s make sure you get the correct offset as i had a 45mm offset on my old ones and never had any problems at all even with it so low on coilovers ive now bought a new set but with an offset of 40 and they are rubbing on the back and i think on the front due to how low it is so going to raise it a little and hopefully this will solve my problem.
It wasn't all that hard to do, I have sold the 18's to a friend and modified his Accent to fit them as well. Took me about an hour to do it to his car and he has less rubbing than I ever had.
I think you would be fine with 17's with your 30mm lowering springs if you're willing to grind out anything the tire hits. The only problem will be the back. I ground away most of the fender lip with a grinder, heated up and pushed back the plastic fender liner where the tire was hitting it. You also have to remove the bolt holding the bumper to the quarter panel very near the wheel well and completely grind off the area where the bolt was. Your bumper still sits fine without the bolt there.
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