For me, I'm running the 2012 HFP suspension. For the 2012, I believe 235/40R18 is 3.3% taller than the 215/45R17 tire that I'm going with and also 2 cm wider.I need to amend my comment a bit. Since the 2015 came with 225/40/18, 235 is only 1.25% taller.
I always think back to my 2012 with the smaller stock wheel.
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From factory my new setup will be on a rim that I think is 1" wider (17x8 vs 18x7) and the offset is 1 cm pushed out (+35mm vs +45mm). I really hope I don't have issues without having to roll fenders.
I should mention I'm getting the Avid.1 AV20 in bronze 17x8 +35mm! That's why I was asking what you were running, dpetro, and hoping you weren't having issues. You still running that set-up?