195/45 R15 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 - 45 is height of the tyre, which is calculated as 45% of the tyre width (195mm), which means the sidewall height has 87.75 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 225/55 R17
(2134.08 mm), 295/35 R21
(2324.46 mm), 225/65 R17
(2275.46 mm), 315/35 R20
(2288.65 mm), 235/40 R18
(2026.96 mm), 235/50 R19
(2254.41 mm), 235/65 R16
(2236.5 mm).
