255/70 R15 doesn't belong to the most popular dimensions for winter tyres - there are 8 tyre models available, which can be compared to
160/70 R17,
205/40 R17,
195/40 R17. Let's break down the sizing - 70 is height of the tyre, which is calculated as 70% of the tyre width (255mm), which means the sidewall height has 178.5 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is 2318.5 mm, which is very similar to 255/65 R16
(2318.18 mm), 255/60 R17
(2317.87 mm), 255/55 R18
(2317.55 mm), 255/50 R19
(2317.24 mm), 255/45 R20
(2316.92 mm), 255/40 R21
(2316.61 mm), 235/65 R17
(2316.3 mm). There are multiple speed indexes available for winter tyres in 255/70 R15: S
(180km/h), T
(190km/h). The same goes for weight indexes: 108.
