315/30 R20 doesn't belong to the most popular dimensions for winter 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 - 30 is height of the tyre, which is calculated as 30% of the tyre width (315mm), which means the sidewall height has 94.5 mm. The wheel diameter is R20, which means it fits to a 20 inch/508mm diameter wheel. The total circumference of the tyre is 2189.69 mm, which is very similar to 225/70 R15
(2186.55 mm), 265/45 R18
(2185.61 mm), 275/30 R21
(2194.09 mm), 195/75 R16
(2195.66 mm), 225/65 R16
(2195.66 mm), 265/40 R19
(2182.15 mm), 155/70 R19
(2197.86 mm).
