265/70 R16.5 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 (265mm), which means the sidewall height has 185.5 mm. The wheel diameter is R17, which means it fits to a 17 inch/431.8mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 235/50 R19(2254.41 mm), 235/65 R16(2236.5 mm), 155/70 R13(1719.08 mm), 245/35 R19(2054.92 mm), 165/60 R14(1739.19 mm), 245/45 R17(2049.26 mm), 170/60 R17(1997.42 mm). There are multiple speed indexes available for winter tyres in 265/70 R16.5: H(210km/h), Q(160km/h), R(170km/h), S(180km/h). The same goes for weight indexes: 110, 115, 121.