225/40 R20 - Best tyres 2025 - market overview, tests, reviews

225/40 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 (225mm), which means the sidewall height has 90 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 215/45 R18(2044.23 mm), 275/55 R19(2466.46 mm), 215/65 R15(2075.02 mm), 285/35 R18(2063.08 mm), 215/85 R16(2425 mm), 285/45 R19(2321.95 mm), 225/45 R19(2152.31 mm).