275/40 R17 - Best summer tyres 2025 - market overview, tests, reviews

275/40 R17 doesn't belong to the most popular dimensions for summer tyres - there are 2 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 40 is height of the tyre, which is calculated as 40% of the tyre width (275mm), which means the sidewall height has 110 mm. The wheel diameter is R17, which means it fits to a 17 inch/431.8mm diameter wheel. The total circumference of the tyre is 2047.69 mm, which is very similar to 200/55 R17(2047.69 mm), 185/80 R14(2047.06 mm), 245/45 R17(2049.26 mm), 205/60 R16(2049.58 mm), 225/60 R15(2045.18 mm), 215/45 R18(2044.23 mm), 170/80 R15(2051.46 mm). There are multiple speed indexes available for summer tyres in 275/40 R17: W(270km/h), Y(300km/h). The same goes for weight indexes: 98.