185/50 R17 doesn't belong to the most popular dimensions for summer tyres - there are 0 tyre models available, which can be compared to
155/60 R15,
170/60 R17,
160/60 R14. Let's break down the sizing - 50 is height of the tyre, which is calculated as 50% of the tyre width (185mm), which means the sidewall height has 92.5 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 1937.73 mm, which is very similar to 205/45 R17
(1936.16 mm), 195/60 R15
(1932.08 mm), 225/35 R18
(1931.14 mm), 185/70 R14
(1930.82 mm), 235/40 R17
(1947.16 mm), 195/55 R16
(1950.61 mm), 205/40 R18
(1951.56 mm).
