265/30 R21 - Best allround tyres 2025 - market overview, tests, reviews

265/30 R21 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 - 30 is height of the tyre, which is calculated as 30% of the tyre width (265mm), which means the sidewall height has 79.5 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 2175.24 mm, which is very similar to 235/50 R18(2174.61 mm), 195/80 R15(2177.12 mm), 265/35 R20(2178.69 mm), 215/55 R18(2179.32 mm), 305/30 R20(2170.84 mm), 235/45 R19(2180.58 mm), 235/55 R17(2168.64 mm).