225/65 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 - 65 is height of the tyre, which is calculated as 65% of the tyre width (225mm), which means the sidewall height has 146.25 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 225/60 R17(2204.77 mm), 305/30 R19(2091.04 mm), 235/35 R19(2032.92 mm), 235/45 R20(2260.38 mm), 235/60 R16(2162.67 mm), 155/60 R15(1781.28 mm), 235/85 R16(2531.81 mm).