235/45 R20 doesn't belong to the most popular dimensions for allround tyres - there are 0 tyre models available, which can be compared to
155/60 R15,
170/60 R17,
160/60 R14. Let's break down the sizing - 45 is height of the tyre, which is calculated as 45% of the tyre width (235mm), which means the sidewall height has 105.75 mm. The wheel diameter is R20, which means it fits to a 20 inch/508mm diameter wheel. The total circumference of the tyre is 2260.38 mm, which is very similar to 265/40 R20
(2261.95 mm), 265/35 R21
(2258.49 mm), 265/30 R22
(2255.04 mm), 225/70 R16
(2266.34 mm), 235/50 R19
(2254.41 mm), 195/55 R20
(2269.8 mm), 235/55 R18
(2248.44 mm). There are multiple speed indexes available for allround tyres in 235/45 R20: H
(210km/h), T
(190km/h), V
(240km/h), W
(270km/h), Y
(300km/h). The same goes for weight indexes: 100.