255/55 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 - 55 is height of the tyre, which is calculated as 55% of the tyre width (255mm), which means the sidewall height has 140.25 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 195/65 R15(1993.34 mm), 265/40 R21(2341.74 mm), 200/60 R17(2110.52 mm), 265/65 R17(2438.82 mm), 205/55 R15(1905.38 mm), 275/30 R21(2194.09 mm), 205/70 R15(2098.58 mm). You can find 255/55 R19 on 12 car models - mainly Land Rover, Mercedes-Benz, Audi, Jaguar, Porsche.