215/60 R18 doesn't belong to the most popular dimensions for winter tyres - there are 1 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 60 is height of the tyre, which is calculated as 60% of the tyre width (215mm), which means the sidewall height has 129 mm. The wheel diameter is R18, which means it fits to a 18 inch/457.2mm diameter wheel. The total circumference of the tyre is 2246.87 mm, which is very similar to 235/55 R18(2248.44 mm), 295/35 R20(2244.67 mm), 205/75 R16(2242.78 mm), 235/60 R17(2242.47 mm), 235/50 R19(2254.41 mm), 265/30 R22(2255.04 mm), 255/45 R19(2237.13 mm). There are multiple speed indexes available for winter tyres in 215/60 R18: H(210km/h), R(170km/h), T(190km/h), V(240km/h). The same goes for weight indexes: 98, 102.