255/65 R18 doesn't belong to the most popular dimensions for winter tyres - there are tyre models available, which can be compared to
325/30 R21,
155/60 R15,
155/65 R13. 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 mm, which is very similar to 225/50 R18
(2143.19 mm), 295/35 R19
(2164.87 mm), 225/60 R18
(2284.57 mm), 305/30 R20
(2170.84 mm), 235/35 R20
(2112.72 mm), 235/50 R17
(2094.81 mm), 235/60 R17
(2242.47 mm).
