325/30 R20 doesn't belong to the most popular dimensions for summer tyres - there are 3 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 (325mm), which means the sidewall height has 97.5 mm. The wheel diameter is R20, which means it fits to a 20 inch/508mm diameter wheel. The total circumference of the tyre is 2208.54 mm, which is very similar to 245/45 R19
(2208.85 mm), 275/40 R19
(2207.28 mm), 215/75 R15
(2210.11 mm), 245/50 R18
(2206.03 mm), 245/40 R20
(2211.68 mm), 225/60 R17
(2204.77 mm), 285/30 R21
(2212.94 mm). There are multiple speed indexes available for summer tyres in 325/30 R20: Y
(300km/h). The same goes for weight indexes: 102, 106.
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