285/55 R18 doesn't belong to the most popular dimensions for summer tyres - there are 2 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 (285mm), which means the sidewall height has 156.75 mm. The wheel diameter is R18, which means it fits to a 18 inch/457.2mm diameter wheel. The total circumference of the tyre is 2421.23 mm, which is very similar to 265/45 R21
(2425 mm), 215/85 R16
(2425 mm), 295/40 R21
(2417.14 mm), 265/50 R20
(2428.45 mm), 295/45 R20
(2430.02 mm), 245/75 R16
(2431.28 mm), 265/55 R19
(2431.91 mm). There are multiple speed indexes available for summer tyres in 285/55 R18: V
(240km/h). The same goes for weight indexes: 113.
