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 205/55 R19
(2224.56 mm), 275/35 R19
(2120.89 mm), 215/35 R18
(1909.15 mm), 275/45 R18
(2213.88 mm), 215/50 R18
(2111.78 mm), 275/65 R18
(2559.46 mm), 215/65 R17
(2234.61 mm). There are multiple speed indexes available for winter tyres in 145/70 R12: Q
(160km/h), T
(190km/h). The same goes for weight indexes: 69.
