305/30 R20 - Best tyres 2025 - market overview, tests, reviews

305/30 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 (305mm), which means the sidewall height has 91.5 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 165/60 R14(1739.19 mm), 245/45 R17(2049.26 mm), 170/60 R17(1997.42 mm), 245/60 R18(2359.96 mm), 175/70 R13(1807.04 mm), 255/35 R19(2076.91 mm), 185/55 R14(1756.46 mm).