255/40 R20 - Best tyres 2026 - 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 195/60 R15(1932.08 mm), 265/40 R18(2102.35 mm), 195/75 R16(2195.66 mm), 265/50 R20(2428.45 mm), 205/50 R15(1840.97 mm), 265/75 R16(2525.53 mm), 205/60 R16(2049.58 mm). You can find 255/40 R20 on 12 car models - mainly Audi, ALPINA, Aston Martin, Mercedes-Benz, Nissan.