255/40 R20 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 - 40 is height of the tyre, which is calculated as 40% of the tyre width (255mm), which means the sidewall height has 102 mm. The wheel diameter is R20, which means it fits to a 20 inch/508mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 255/55 R20
(2477.15 mm), 195/40 R17
(1846.63 mm), 265/30 R19
(2015.65 mm), 195/60 R14
(1852.28 mm), 265/35 R22
(2338.29 mm), 195/70 R16
(2134.4 mm), 265/50 R19
(2348.65 mm). You can find 255/40 R20 on 12 car models - mainly .
