15x8 plus 25 is the honest NA Miata answer. Stock 15x6 plus 40 puts your outer edge at 116.2mm — an 8 with plus 25 sits 126.6. Ten millimeters of poke, forty millimeters of extra tire tucked inboard, and a 195/50 or 205/50 that clears with a light fender roll. 15x9 plus 36 on a 225/45 is the 6UL track answer, not a shortcut. The plus-zero dish and a spacer is how you end up eating wheel bearings on a 2,300 lb car. Send this to whoever's about to order plus-zero 15x8s. #ThreePieceUS #NAMiata #MiataFitment #4x100 #WheelOffset #RPF1 #6UL #MX5 #wheels #cars