275/30 R21 - Best tyres 2026 - market overview, tests, reviews

275/30 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 (275mm), which means the sidewall height has 82.5 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 295/30 R19(2072.19 mm), 225/55 R19(2293.68 mm), 295/45 R20(2430.02 mm), 225/70 R16(2266.34 mm), 325/30 R21(2288.34 mm), 235/45 R17(2020.99 mm), 235/55 R18(2248.44 mm).