180/70 R15 doesn't belong to the most popular dimensions for summer tyres - there are 2 tyre models available, which can be compared to
155/60 R15,
170/60 R17,
160/60 R14. Let's break down the sizing - 70 is height of the tyre, which is calculated as 70% of the tyre width (180mm), which means the sidewall height has 126 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is 1988.63 mm, which is very similar to 185/75 R14
(1988.94 mm), 205/55 R16
(1985.17 mm), 295/30 R18
(1992.4 mm), 225/45 R17
(1992.71 mm), 195/65 R15
(1993.34 mm), 225/50 R16
(1983.6 mm), 175/80 R14
(1996.8 mm). There are multiple speed indexes available for summer tyres in 180/70 R15: H
(210km/h). The same goes for weight indexes: 76.
