145/70 R12 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 - 70 is height of the tyre, which is calculated as 70% of the tyre width (145mm), which means the sidewall height has 101.5 mm. The wheel diameter is R12, which means it fits to a 12 inch/304.8mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 235/65 R18
(2396.09 mm), 155/80 R13
(1816.47 mm), 245/35 R21
(2214.51 mm), 165/65 R13
(1711.23 mm), 245/45 R19
(2208.85 mm), 175/55 R15
(1801.7 mm), 245/70 R16
(2354.31 mm).
