265/30 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 - 30 is height of the tyre, which is calculated as 30% of the tyre width (265mm), which means the sidewall height has 79.5 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 265/65 R18
(2518.61 mm), 205/55 R16
(1985.17 mm), 275/35 R18
(2041.09 mm), 205/75 R16
(2242.78 mm), 275/40 R22
(2446.67 mm), 215/45 R18
(2044.23 mm), 275/65 R17
(2479.66 mm).
