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 245/50 R20
(2365.62 mm), 175/65 R14
(1831.86 mm), 255/30 R20
(2076.59 mm), 180/65 R16
(2011.88 mm), 255/45 R17
(2077.54 mm), 185/65 R14
(1872.7 mm), 255/55 R20
(2477.15 mm). You can find 255/40 R20 on 12 car models - mainly .
