245/40 R17 - Best tyres 2025 - market overview, tests, reviews

245/40 R17 doesn't belong to the most popular dimensions for 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 R17, which means it fits to a 17 inch/431.8mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 225/60 R16(2124.97 mm), 305/30 R19(2091.04 mm), 235/30 R20(2038.89 mm), 235/45 R19(2180.58 mm), 235/55 R20(2408.03 mm), 235/75 R15(2304.36 mm), 160/60 R15(1800.13 mm).