275/60 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 - 60 is height of the tyre, which is calculated as 60% of the tyre width (275mm), which means the sidewall height has 165 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 185/75 R14(1988.94 mm), 255/60 R18(2397.66 mm), 195/50 R15(1809.56 mm), 265/30 R21(2175.24 mm), 195/65 R14(1913.54 mm), 265/40 R19(2182.15 mm), 200/55 R17(2047.69 mm).