255/40 R18 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 R18, which means it fits to a 18 inch/457.2mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 225/70 R15
(2186.55 mm), 325/25 R20
(2106.44 mm), 235/40 R19
(2106.75 mm), 235/55 R17
(2168.64 mm), 235/65 R17
(2316.3 mm), 155/70 R19
(2197.86 mm), 245/35 R20
(2134.71 mm). You can find 255/40 R18 on 14 car models - mainly .
