Got some inexpensive 245/40/18 all seasons. Specs for wheels are 18x8.5 et42. I did have to do the fender screw modification to avoid rub on bad roads (dips caused it to rub).
Pictures with 245/40/18's on stock rims please - RX8Club.com
would 245/40/18 be enough?
2015 Subaru BRZ Premium with 18x9.5 Aodhan Ds07 and Toyo Tires 245x40 on Stock Suspension | 718835 | Fitment Industries
Amazon.com: Fullway HP108 All-Season High Performance Radial Tire-245/40R18 245/40ZR18 245/40/18 245/40-18 97W Load Range XL 4-Ply BSW Black Side Wall : Electronics
245/40/18 Potenza RE01-R's on 18x9 +29 Advan RS's - EvolutionM - Mitsubishi Lancer and Lancer Evolution Community
Crosswind All Season UHP All Season 245/40R18 97W XL Passenger Tire - Walmart.com