205/55 R19 doesn't belong to the most popular dimensions for allround tyres - there are 1 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 (205mm), which means the sidewall height has 112.75 mm. The wheel diameter is R19, which means it fits to a 19 inch/482.6mm diameter wheel. The total circumference of the tyre is 2224.56 mm, which is very similar to 285/35 R20(2222.68 mm), 215/70 R16(2222.36 mm), 285/40 R19(2232.42 mm), 215/65 R17(2234.61 mm), 245/35 R21(2214.51 mm), 275/45 R18(2213.88 mm), 225/55 R18(2213.88 mm). There are multiple speed indexes available for allround tyres in 205/55 R19: H(210km/h), V(240km/h). The same goes for weight indexes: 97.