245/60 R18 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 (245mm), which means the sidewall height has 147 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 2359.96 mm, which is very similar to 265/70 R15
(2362.48 mm), 245/65 R17
(2357.14 mm), 245/70 R16
(2354.31 mm), 245/50 R20
(2365.62 mm), 275/40 R21
(2366.88 mm), 315/30 R22
(2349.28 mm), 265/50 R19
(2348.65 mm). There are multiple speed indexes available for winter tyres in 245/60 R18: H
(210km/h), Q
(160km/h), R
(170km/h), S
(180km/h), T
(190km/h). The same goes for weight indexes: 104, 105, 109, 110.