265/45 R18 - Best winter tyres 2025 - market overview, tests, reviews

265/45 R18 doesn't belong to the most popular dimensions for winter tyres - there are 3 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 45 is height of the tyre, which is calculated as 45% of the tyre width (265mm), which means the sidewall height has 119.25 mm. The wheel diameter is R18, which means it fits to a 18 inch/457.2mm diameter wheel. The total circumference of the tyre is 2185.61 mm, which is very similar to 225/70 R15(2186.55 mm), 265/40 R19(2182.15 mm), 235/45 R19(2180.58 mm), 215/55 R18(2179.32 mm), 265/35 R20(2178.69 mm), 275/30 R21(2194.09 mm), 195/80 R15(2177.12 mm). There are multiple speed indexes available for winter tyres in 265/45 R18: V(240km/h). The same goes for weight indexes: 101.