We have not yet tried 285/35R18, for a couple of reasons. One is that the tire is 2.1% larger than the stock 2011+ WRX tire, slightly over our 2% rule of thumb in terms of variance from stock.
How did you compute for the 2.1% variance comparing 285/35R18 vs 235/45R17 (stock)? Curious as to how I could use this as a benchmark. Thanks!