Got RPF1's but posted by KA8 on August 12, 2016 at 03:30 PM
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I have them in 18x9.5 +45 (10mm spacers, extended studs) up front with 350Z rotors with stock calipers at the moment. There's maybe 4mm of clearance between the back of the spokes and the face of the caliper. No clearance issues with the barrel.
However, my 17Z swap was a different story... Same wheels but needed about 15mm (can't remember at the moment) spacers and some fender work.