255/50 R18 - Best tyres 2025 - market overview, tests, reviews

255/50 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 - 50 is height of the tyre, which is calculated as 50% of the tyre width (255mm), which means the sidewall height has 127.5 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 mm, which is very similar to 155/70 R19(2197.86 mm), 245/35 R20(2134.71 mm), 165/60 R15(1818.98 mm), 245/45 R18(2129.06 mm), 170/80 R15(2051.46 mm), 245/65 R17(2357.14 mm), 175/70 R14(1886.84 mm).