180/65 R16 doesn't belong to the most popular dimensions for summer tyres - there are 11 tyre models available, which can be compared to
170/80 R15,
165/70 R13,
325/30 R21. Let's break down the sizing - 65 is height of the tyre, which is calculated as 65% of the tyre width (180mm), which means the sidewall height has 117 mm. The wheel diameter is R16, which means it fits to a 16 inch/406.4mm diameter wheel. The total circumference of the tyre is 2011.88 mm, which is very similar to 195/60 R16
(2011.88 mm), 225/35 R19
(2010.93 mm), 190/55 R17
(2013.13 mm), 265/30 R19
(2015.65 mm), 265/35 R18
(2019.1 mm), 215/55 R16
(2019.73 mm), 235/45 R17
(2020.99 mm). There are multiple speed indexes available for summer tyres in 180/65 R16: H
(210km/h). The same goes for weight indexes: 81.
