335/30 R18 doesn't belong to the most popular dimensions for summer tyres - there are 3 tyre models available, which can be compared to
155/60 R15,
170/60 R17,
160/60 R14. Let's break down the sizing - 30 is height of the tyre, which is calculated as 30% of the tyre width (335mm), which means the sidewall height has 100.5 mm. The wheel diameter is R18, which means it fits to a 18 inch/457.2mm diameter wheel. The total circumference of the tyre is 2067.8 mm, which is very similar to 205/55 R17
(2064.97 mm), 295/30 R19
(2072.19 mm), 225/50 R17
(2063.4 mm), 225/45 R18
(2072.51 mm), 285/35 R18
(2063.08 mm), 195/65 R16
(2073.14 mm), 215/65 R15
(2075.02 mm). There are multiple speed indexes available for summer tyres in 335/30 R18: Y
(300km/h). The same goes for weight indexes: 102.
