265/40 R21 - Best tyres 2024 - market overview, tests, reviews

265/40 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 - 40 is height of the tyre, which is calculated as 40% of the tyre width (265mm), which means the sidewall height has 106 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 215/45 R17(1964.44 mm), 275/55 R19(2466.46 mm), 215/60 R17(2167.07 mm), 285/35 R18(2063.08 mm), 215/80 R15(2277.65 mm), 285/45 R19(2321.95 mm), 225/45 R18(2072.51 mm).