205/40 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 (205mm), which means the sidewall height has 82 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 185/80 R14
(2047.06 mm), 255/70 R15
(2318.5 mm), 195/55 R15
(1870.82 mm), 265/35 R19
(2098.9 mm), 195/65 R16
(2073.14 mm), 265/45 R18
(2185.61 mm), 205/40 R18
(1951.56 mm). You can find 205/40 R17 on 16 car models - mainly .
