170/80 R15 doesn't belong to the most popular dimensions for summer tyres - there are 11 tyre models available, which can be compared to
175/55 R15,
165/70 R13,
325/30 R21. Let's break down the sizing - 80 is height of the tyre, which is calculated as 80% of the tyre width (170mm), which means the sidewall height has 136 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is 2051.46 mm, which is very similar to 245/40 R18
(2052.09 mm), 285/30 R19
(2053.34 mm), 205/60 R16
(2049.58 mm), 245/45 R17
(2049.26 mm), 225/55 R16
(2054.29 mm), 195/70 R15
(2054.6 mm), 245/35 R19
(2054.92 mm). There are multiple speed indexes available for summer tyres in 170/80 R15: H
(210km/h), S
(180km/h). The same goes for weight indexes: 77, 83.
