Kumho WinterCraft WP51 is a winter tyre made in total of 66 sizes, ranging from R13 to R13 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/50 R17 is 70mm wider than the narrowest dimension (145) and 10mm narrower than the widest one (225). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (215mm), which results in 107.5mm sidewall height. In 215/50 R17, there is only one possible speed index for Kumho WinterCraft WP51 - "H", which is good for speeds up to 210 km/h. In 215/50 R17, WinterCraft WP51 usually competes against Winterhawk 3, which is a tyre from Firestone with a rating of 0%, compared to 20% of the Kumho in question.