185/55 R16 doesn't belong to the most popular dimensions for winter tyres - there are 13 tyre models available, which can be compared to 185/50 R16, 175/75 R16, 195/65 R16. Let's break down the sizing - 55 is height of the tyre, which is calculated as 55% of the tyre width (185mm), which means the sidewall height has 101.75 mm. The wheel diameter is R16, which means it fits to a 16 inch/406.4mm diameter wheel. The total circumference of the tyre is 1916.06 mm, which is very similar to 195/65 R14(1913.54 mm), 175/65 R15(1911.66 mm), 205/50 R16(1920.77 mm), 215/35 R18(1909.15 mm), 205/55 R15(1905.38 mm), 185/70 R14(1930.82 mm), 225/35 R18(1931.14 mm). There are multiple speed indexes available for winter tyres in 185/55 R16: H(210km/h), S(180km/h), T(190km/h). The same goes for weight indexes: 83, 87. You can find 185/55 R16 on 9 car models - mainly Honda, Nissan, Suzuki, Renault, Toyota.