Actually the sidewall height is (according to the aspect ratio) the same for a 235/35/19 and a 275/30/19. Heres the math for anyone who is interested:

Ex.1 235/35/19 means 235(235mm width of tire from bulge to bulge)/35(35% of 235)/19(rim size)= 235mm x .35(35%)= 82.5 mm. 82.5mm is your selected sidewall height. 82.5mm/25.4mm(25.4mm=1")= 3 1/4". 3 1/4" x 2(top sidewall + bottom sidewall) + 19"(rim)= 25.5" total diameter of tire and wheel combo.


Ex.2 275/30/19 = 275mm x .30(30%) = 82.5mm sidewall height = 3 1/4" sidewall height. 3 1/4" x 2 = 6.5". 6.5" + 19"(wheel) = 25.5" total diameter for a 275/30/19. Which as you can see from my previous example is the same diameter as a 235/35/19. The sidewalls are the same height.

As you can see mathematically the circumference of the tires would technically be the same as they have the same diameter.

Hope that this helps anyone who is unfamiliar with how this type of aspect ratio is used to determine overall diameter of a tire wheel combo.

I agree with the post above as well. The width is what would concern me. I don't know if that wide of a tire (275/30/19) would fit. The look is, as with all mods you do, personal preference. Not my personal choice for a look to go for but my preference shouldn't mean squat. Its your car.