PNW Wider is better, even 265/35/19 f and 285/35/19 r if they are available. Not totally sure that setup will fit. I do know that 265/35/18 f and 285/30/18 work. You may need to use a 255/35/19f and a 285/35/19r. On slick tracks like concrete, more rubber is better, just more grip. If you are road racing, then other factors come into play, but you are just using 1st and 2nd gear. I don't have a reference point for your front using the larger tire in 19 inch. At the outside you can use a 5 mm spacer to get the tire away from the shock or spring on a coilover.