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

285/30 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 (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 2212.94 mm, which is very similar to 225/55 R18(2213.88 mm), 275/45 R18(2213.88 mm), 245/40 R20(2211.68 mm), 245/35 R21(2214.51 mm), 215/75 R15(2210.11 mm), 245/45 R19(2208.85 mm), 275/40 R19(2207.28 mm).