190/55 R17 doesn't belong to the most popular dimensions for allround tyres - there are 5 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 55 is height of the tyre, which is calculated as 55% of the tyre width (190mm), which means the sidewall height has 104.5 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 2013.13 mm, which is very similar to 195/60 R16(2011.88 mm), 180/65 R16(2011.88 mm), 225/35 R19(2010.93 mm), 265/30 R19(2015.65 mm), 265/35 R18(2019.1 mm), 215/55 R16(2019.73 mm), 235/45 R17(2020.99 mm). There are multiple speed indexes available for allround tyres in 190/55 R17: W(270km/h). The same goes for weight indexes: 75.