245/40 R18 - Best tyres 2025 - market overview, tests, reviews

245/40 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 (245mm), which means the sidewall height has 98 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 185/55 R16(1916.06 mm), 255/50 R19(2317.24 mm), 185/75 R16(2148.54 mm), 255/65 R17(2397.98 mm), 195/50 R16(1889.35 mm), 265/35 R18(2019.1 mm), 195/65 R15(1993.34 mm). You can find 245/40 R18 on 29 car models - mainly Mercedes-Benz, Audi, Volvo, ALPINA, BMW.