Imperial Snowdragon HP is a winter tyre made in total of 65 sizes, ranging from R13 to R13 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 205/65 R15 is 60mm wider than the narrowest dimension (145) and -10mm narrower than the widest one (195). This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (205mm), which results in 133.25mm sidewall height. In 205/65 R15, there is only one possible speed index for Imperial Snowdragon HP - "H", which is good for speeds up to 210 km/h. In 205/65 R15, Snowdragon HP usually competes against Winter Sport 5, which is a tyre from Dunlop with a rating of 88%, compared to 0% of the Imperial in question.