255/45 R19 doesn't belong to the most popular dimensions for tyres - there are tyre models available, which can be compared to 325/30 R21, 155/60 R15, 155/65 R13. Let's break down the sizing - 45 is height of the tyre, which is calculated as 45% of the tyre width (255mm), which means the sidewall height has 114.75 mm. The wheel diameter is R19, which means it fits to a 19 inch/482.6mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 185/60 R16(1974.18 mm), 255/55 R19(2397.35 mm), 190/55 R17(2013.13 mm), 255/70 R18(2557.88 mm), 195/55 R20(2269.8 mm), 265/35 R21(2258.49 mm), 195/70 R15(2054.6 mm). You can find 255/45 R19 on 5 car models - mainly Mercedes-Benz, Audi, Porsche, Seat.