235/55 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 - 55 is height of the tyre, which is calculated as 55% of the tyre width (235mm), which means the sidewall height has 129.25 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 245/35 R19
(2054.92 mm), 160/70 R17
(2060.26 mm), 245/45 R17
(2049.26 mm), 165/80 R13
(1866.73 mm), 245/60 R18
(2359.96 mm), 175/65 R15
(1911.66 mm), 255/35 R19
(2076.91 mm).
