215/40 R18 - Best tyres 2025 - market overview, tests, reviews

215/40 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 (215mm), which means the sidewall height has 86 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 255/70 R18(2557.88 mm), 195/55 R20(2269.8 mm), 265/35 R21(2258.49 mm), 195/70 R15(2054.6 mm), 265/45 R21(2425 mm), 205/45 R16(1856.37 mm), 265/70 R16(2442.27 mm). You can find 215/40 R18 on 9 car models - mainly Alfa Romeo, Hyundai, Alpine, Audi, BMW.