255/65 R18 doesn't belong to the most popular dimensions for winter tyres - there are 0 tyre models available, which can be compared to
155/60 R15,
170/60 R17,
160/60 R14. Let's break down the sizing - 65 is height of the tyre, which is calculated as 65% of the tyre width (255mm), which means the sidewall height has 165.75 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 2477.77 mm, which is very similar to 255/55 R20
(2477.15 mm), 275/65 R17
(2479.66 mm), 285/45 R21
(2481.54 mm), 285/40 R22
(2471.81 mm), 275/70 R16
(2486.26 mm), 315/40 R21
(2467.41 mm), 275/55 R19
(2466.46 mm). There are multiple speed indexes available for winter tyres in 255/65 R18: H
(210km/h). The same goes for weight indexes: 111, 115.
