225/65 R18 - Best summer tyres 2025 - market overview, tests, reviews

225/65 R18 doesn't belong to the most popular dimensions for summer tyres - there are 4 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. 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 2355.25 mm, which is very similar to 245/70 R16(2354.31 mm), 245/65 R17(2357.14 mm), 245/60 R18(2359.96 mm), 315/30 R22(2349.28 mm), 265/50 R19(2348.65 mm), 265/70 R15(2362.48 mm), 265/45 R20(2345.2 mm). There are multiple speed indexes available for summer tyres in 225/65 R18: H(210km/h), V(240km/h). The same goes for weight indexes: 103, 107.