255/40 R20 - Best tyres 2025 - market overview, tests, reviews

255/40 R20 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 (255mm), which means the sidewall height has 102 mm. The wheel diameter is R20, which means it fits to a 20 inch/508mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 165/65 R13(1711.23 mm), 245/45 R19(2208.85 mm), 175/55 R15(1801.7 mm), 245/70 R16(2354.31 mm), 175/75 R16(2101.41 mm), 255/40 R17(1997.42 mm), 185/55 R16(1916.06 mm). You can find 255/40 R20 on 12 car models - mainly Audi, ALPINA, Aston Martin, Mercedes-Benz, Nissan.