Though I have a 350z, I have 30mm spacer in the front and 20mm spacer in the rear. Hubcentric with built in studs.

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https://fbcdn-sphotos-a.akamaihd.net...61332990_n.jpg

if you get conservative offsets you can make more adjustments vs buying aggressive offsets and hope it's right for the car's geometry and the kind of driving dynamics expected. there is so much you can achieve with just adjusting offsets.

I'm talking about wheel studs!

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i have nothing against stud replacement type, btw. i like those cause you can get like a 25mm setup and use any thing from 3 to 25mm if you have open lugs (for aftermarket wheels using tapered lugs).

bolt-on types are just as safe if installed correctly, and more convenient just as long as there are cavities between the lug bores on the wheels...which the stock wheels dont have much of on the front.