225/45 R18 - Best tyres 2025 - market overview, tests, reviews

225/45 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 (225mm), which means the sidewall height has 101.25 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 185/65 R15(1952.5 mm), 255/60 R17(2317.87 mm), 195/45 R15(1748.3 mm), 265/30 R20(2095.44 mm), 195/60 R15(1932.08 mm), 265/40 R18(2102.35 mm), 195/75 R16(2195.66 mm). You can find 225/45 R18 on 35 car models - mainly Mercedes-Benz, BMW, Kia, Subaru, Mazda.