285/40 R17 - Best summer tyres 2025 - market overview, tests, reviews

285/40 R17 doesn't belong to the most popular dimensions for summer tyres - there are 1 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 (285mm), which means the sidewall height has 114 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 2072.82 mm, which is very similar to 225/45 R18(2072.51 mm), 195/65 R16(2073.14 mm), 295/30 R19(2072.19 mm), 215/65 R15(2075.02 mm), 305/25 R20(2075.02 mm), 255/30 R20(2076.59 mm), 255/35 R19(2076.91 mm). There are multiple speed indexes available for summer tyres in 285/40 R17: Y(300km/h). The same goes for weight indexes: 100.