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 215/85 R16
(2425 mm), 285/45 R20
(2401.75 mm), 225/45 R19
(2152.31 mm), 295/30 R20
(2151.99 mm), 225/60 R15
(2045.18 mm), 305/25 R20
(2075.02 mm), 225/75 R16
(2337.03 mm). You can find 255/40 R20 on 12 car models - mainly .
