265/40 R18 - Best tyres 2025 - market overview, tests, reviews

265/40 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 (265mm), which means the sidewall height has 106 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 255/65 R17(2397.98 mm), 195/55 R15(1870.82 mm), 265/35 R18(2019.1 mm), 195/65 R16(2073.14 mm), 265/45 R18(2185.61 mm), 205/40 R17(1871.76 mm), 265/65 R18(2518.61 mm).