245/35 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 - 35 is height of the tyre, which is calculated as 35% of the tyre width (245mm), which means the sidewall height has 85.75 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 205/65 R16(2113.98 mm), 275/40 R20(2287.08 mm), 215/45 R16(1884.64 mm), 275/55 R17(2306.87 mm), 215/60 R16(2087.27 mm), 285/30 R21(2212.94 mm), 215/75 R16(2289.91 mm). You can find 245/35 R20 on 24 car models - mainly Aston Martin, Ferrari, Maserati, Porsche, BMW.