245/30 R21 - Best winter tyres 2025 - market overview, tests, reviews

245/30 R21 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 (245mm), which means the sidewall height has 73.5 mm. The wheel diameter is R21, which means it fits to a 21 inch/533.4mm diameter wheel. The total circumference of the tyre is 2137.54 mm, which is very similar to 245/35 R20(2134.71 mm), 195/70 R16(2134.4 mm), 225/55 R17(2134.08 mm), 285/30 R20(2133.14 mm), 215/70 R15(2142.57 mm), 285/35 R19(2142.88 mm), 225/50 R18(2143.19 mm).