Yokohama BluEarth-4S AW21 is a allround tyre made in total of 43 sizes, ranging from R14 to R14 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 225/50 R17 is 50mm wider than the narrowest dimension (175) and 10mm narrower than the widest one (235). 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 Yokohama BluEarth-4S AW21 - "V", which is good for speeds up to 240 km/h. In 225/50 R17, BluEarth-4S AW21 usually competes against Seasonproof, which is a tyre from Nokian with a rating of 66%, compared to 31% of the Yokohama in question.