245/40 R40 - Best allround tyres 2025 - market overview, tests, reviews

245/40 R40 doesn't belong to the most popular dimensions for allround 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 (245mm), which means the sidewall height has 98 mm. The wheel diameter is R40, which means it fits to a 40 inch/1016mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 185/80 R14(2047.06 mm), 255/65 R17(2397.98 mm), 195/55 R15(1870.82 mm), 265/35 R18(2019.1 mm), 195/65 R16(2073.14 mm), 265/40 R21(2341.74 mm), 205/40 R17(1871.76 mm).