245/55 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 - 55 is height of the tyre, which is calculated as 55% of the tyre width (245mm), which means the sidewall height has 134.75 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 255/55 R19(2397.35 mm), 190/55 R17(2013.13 mm), 255/70 R18(2557.88 mm), 195/55 R20(2269.8 mm), 265/35 R21(2258.49 mm), 195/70 R15(2054.6 mm), 265/45 R21(2425 mm).