255/55 R17 doesn't belong to the most popular dimensions for summer tyres - there are 4 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 (255mm), which means the sidewall height has 140.25 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 2237.76 mm, which is very similar to 255/45 R19
(2237.13 mm), 255/40 R20
(2236.81 mm), 235/65 R16
(2236.5 mm), 215/65 R17
(2234.61 mm), 235/60 R17
(2242.47 mm), 205/75 R16
(2242.78 mm), 285/40 R19
(2232.42 mm). There are multiple speed indexes available for summer tyres in 255/55 R17: V
(240km/h). The same goes for weight indexes: 104.
