175/60 R15 doesn't belong to the most popular dimensions for winter tyres - there are 11 tyre models available, which can be compared to 170/80 R15, 165/70 R13, 325/30 R21. Let's break down the sizing - 60 is height of the tyre, which is calculated as 60% of the tyre width (175mm), which means the sidewall height has 105 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is 1856.68 mm, which is very similar to 205/45 R16(1856.37 mm), 185/50 R16(1857.94 mm), 195/60 R14(1852.28 mm), 195/40 R17(1846.63 mm), 165/80 R13(1866.73 mm), 165/70 R14(1842.86 mm), 165/65 R15(1870.82 mm). There are multiple speed indexes available for winter tyres in 175/60 R15: H(210km/h), T(190km/h). The same goes for weight indexes: 81.