I have Enkei PF01 in 18 x 9.5 ET 35 for fronts and rears. I run 15mm spacer at the front and 25mm spacer at the rear, both spacers are hub-centric and secured to the hub with concentric cone nuts machined to fit flush with the spacer face to minimize stress on the studs. I also have to have rings machined for the spacer (which was Nissan OEM sized at 66mm) as the Enkei bore hole is 75mm and I could not find any spacers sized to suit.
I run 265/35R18 A048 R-Specs for track tyres (have used Nitto NT01 in 275/35R18 in the past but cannot get them locally and the Yoki's are a cost-effective alternative until supplies of the A048 are exhausted - it has been replaced by the A050 in Oz).
To check caliper clearance, you either need a physical wheel to trial fit, OR the manufacturers back-clearance diagram to be sure. What I can say is the there is generous caliper clearance with my setup.
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