245/70 R17 doesn't belong to the most popular dimensions for 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 (245mm), which means the sidewall height has 171.5 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 195/55 R15
(1870.82 mm), 265/35 R19
(2098.9 mm), 195/65 R16
(2073.14 mm), 265/45 R18
(2185.61 mm), 205/40 R17
(1871.76 mm), 265/65 R18
(2518.61 mm), 205/55 R16
(1985.17 mm).