255/45 R18 - Best tyres 2025 - market overview, tests, reviews

255/45 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 - 45 is height of the tyre, which is calculated as 45% of the tyre width (255mm), which means the sidewall height has 114.75 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 245/45 R20(2288.65 mm), 175/60 R14(1776.88 mm), 245/70 R17(2434.11 mm), 175/80 R14(1996.8 mm), 255/40 R18(2077.22 mm), 185/60 R14(1814.58 mm), 255/50 R20(2397.04 mm). You can find 255/45 R18 on 9 car models - mainly Audi, Bentley, Mercedes-Benz, Aston Martin, Cadillac.