255/30 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 - 30 is height of the tyre, which is calculated as 30% of the tyre width (255mm), which means the sidewall height has 76.5 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 255/70 R16
(2398.29 mm), 195/55 R16
(1950.61 mm), 265/35 R20
(2178.69 mm), 195/70 R14
(1974.81 mm), 265/45 R20
(2345.2 mm), 205/40 R18
(1951.56 mm), 265/70 R15
(2362.48 mm).
