I'm running 20x10 with +25mm offset on the front with 285/35's. I have no issues. Based on the factory offset on the rear at +39mm (and assuming my math is right), you would need a 5mm spacer to achieve the same backspacing (or clearance) I have. In my opinion, a 5mm spacer is plenty safe for street duty. I would not track it or be overly aggressive with them. However to get the 15mm "push" out towards the fender you want, you would need 15mm more spacing bringing the grand total to 20mm. I personally would not do this, but I know many have.
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