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 265/30 R21
(2175.24 mm), 195/60 R16
(2011.88 mm), 265/40 R19
(2182.15 mm), 195/80 R15
(2177.12 mm), 265/55 R19
(2431.91 mm), 205/50 R16
(1920.77 mm), 275/30 R19
(2034.5 mm). You can find 255/40 R20 on 12 car models - mainly .
