285/45 R21 - Best tyres 2025 - market overview, tests, reviews

285/45 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 - 45 is height of the tyre, which is calculated as 45% of the tyre width (285mm), which means the sidewall height has 128.25 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 215/80 R15(2277.65 mm), 285/40 R22(2471.81 mm), 225/45 R18(2072.51 mm), 295/30 R19(2072.19 mm), 225/55 R19(2293.68 mm), 295/45 R20(2430.02 mm), 225/70 R16(2266.34 mm).