Imperial Snowdragon 3 is a winter tyre made in total of 41 sizes, ranging from R15 to R15 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 225/40 R19 is 50mm wider than the narrowest dimension (175) and 50mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In 225/40 R19, there is only one possible speed index for Imperial Snowdragon 3 - "V", which is good for speeds up to 240 km/h. In 225/40 R19, Snowdragon 3 usually competes against Blizzak LM-005, which is a tyre from Bridgestone with a rating of 87%, compared to 0% of the Imperial in question.