285/30 R21 - Best tyres 2025 - market overview, tests, reviews

285/30 R21 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 (285mm), which means the sidewall height has 85.5 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 mm, which is very similar to 245/75 R16(2431.28 mm), 180/55 R17(1978.58 mm), 255/40 R19(2157.02 mm), 185/60 R15(1894.38 mm), 255/50 R20(2397.04 mm), 190/50 R17(1953.44 mm), 255/70 R15(2318.5 mm).