225/45 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 - 45 is height of the tyre, which is calculated as 45% of the tyre width (225mm), which means the sidewall height has 101.25 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 275/35 R21
(2280.48 mm), 215/40 R16
(1817.1 mm), 275/45 R20
(2373.47 mm), 215/55 R16
(2019.73 mm), 285/25 R20
(2043.61 mm), 215/70 R15
(2142.57 mm), 285/35 R22
(2382.27 mm). You can find 225/45 R18 on 35 car models - mainly .
