Dunlop Winter is a winter tyre made in total of 65 sizes, ranging from R15 to R15 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 225/50 R17 is 40mm wider than the narrowest dimension (185) and 20mm narrower than the widest one (245). 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 R17, there is only one possible speed index for Dunlop Winter - "V", which is good for speeds up to 240 km/h. In 225/50 R17, Winter usually competes against N blue HD plus, which is a tyre from Nexen with a rating of 0%, compared to 0% of the Dunlop in question.