155/60 R15 doesn't belong to the most popular dimensions for all-tests tyres - there are tyre models available, which can be compared to 325/30 R21, 155/65 R13, 155/65 R14. Let's break down the sizing - 60 is height of the tyre, which is calculated as 60% of the tyre width (155mm), which means the sidewall height has 93 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 235/40 R19(2106.75 mm), 235/55 R17(2168.64 mm), 235/65 R17(2316.3 mm), 155/70 R19(2197.86 mm), 245/35 R20(2134.71 mm), 165/60 R15(1818.98 mm), 245/45 R18(2129.06 mm).