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

245/40 R40 doesn't belong to the most popular dimensions for winter 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 235/65 R16(2236.5 mm), 155/70 R13(1719.08 mm), 245/35 R19(2054.92 mm), 165/60 R14(1739.19 mm), 245/45 R17(2049.26 mm), 170/60 R17(1997.42 mm), 245/60 R18(2359.96 mm).