235/60 R18 doesn't belong to the most popular dimensions for tyres - there are tyre models available, which can be compared to 325/30 R21, 155/60 R15, 155/65 R13. Let's break down the sizing - 60 is height of the tyre, which is calculated as 60% of the tyre width (235mm), which means the sidewall height has 141 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 mm, which is very similar to 275/45 R19(2293.68 mm), 215/50 R18(2111.78 mm), 275/70 R16(2486.26 mm), 215/65 R17(2234.61 mm), 285/35 R21(2302.47 mm), 225/35 R19(2010.93 mm), 285/50 R20(2491.28 mm). You can find 235/60 R18 on 22 car models - mainly Land Rover, Audi, Hyundai, Jaguar, Mercedes-Benz.