365/85 R20 - Best summer tyres 2025 - market overview, tests, reviews

365/85 R20 doesn't belong to the most popular dimensions for summer 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 - 85 is height of the tyre, which is calculated as 85% of the tyre width (365mm), which means the sidewall height has 310.25 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 275/40 R20(2287.08 mm), 215/45 R17(1964.44 mm), 275/55 R17(2306.87 mm), 215/60 R17(2167.07 mm), 285/30 R21(2212.94 mm), 215/80 R15(2277.65 mm), 285/40 R22(2471.81 mm). There are multiple speed indexes available for summer tyres in 365/85 R20: J(km/h). The same goes for weight indexes: 164.