Imperial SnowDragon UHP is a winter tyre made in total of 61 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/50 R18 is 20mm wider than the narrowest dimension (205) and 70mm narrower than the widest one (295). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (225mm), which results in 112.5mm sidewall height. In
225/50 R18, SnowDragon UHP usually competes against
UltraGrip Performance Gen-1, which is a tyre from
Goodyear with a rating of 0%, compared to 0% of the
Imperial in question.