I'm running the mt1-r, slightly different design. 17" with slight lip so the spokes look little smaller but the size was perfect for a cheap track wheel (17x9 et 40 square with 5mm spacer on all 4 effectively making it 35mm offset) with 255/40-17 but for a M you may as well go 265/35-18. Are you on stock suspension though? You may run up front without some camber.