265/70 R16.5 doesn't belong to the most popular dimensions for allround 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 195/65 R15(1993.34 mm), 265/40 R20(2261.95 mm), 200/60 R17(2110.52 mm), 265/60 R18(2435.36 mm), 205/55 R15(1905.38 mm), 275/30 R20(2114.29 mm), 205/70 R15(2098.58 mm). There are multiple speed indexes available for allround tyres in 265/70 R16.5: H(210km/h), J(km/h), M(km/h), Q(160km/h), R(170km/h), S(180km/h), T(190km/h). The same goes for weight indexes: 112, 113, 115, 116, 118, 121, 138, 139, 140, 143.